Holman Air Compressor, 210 cfm, Type T25

The air compressor, illustrated above, is the Holman 210 cu. ft/mm. (free air) capacity and supplies air to pneumatic breakers, jack hammers, clay diggers and similar hand excavating and demolition tools at a pressure of 100 lb/sq. in.

The plant consists of a power unit which is coupled to an air compressor unit. The two units are mounted in a steel frame, with four steel-tyred wheels and tow bar.

The power unit is governed so that when the pressure in the storage tank reaches a certain point (generally 90 lb/sq. in.) the speed of the engine is reduced and, conversely, when the pressure is reduced the speed of the engine is increased.

The air compressor should be set level when working so that no damage will be caused by starving the engine of oil.  The compressor should not be towed at a higher speed than 5 mph.

Weight - 3 tons.

Overall dimensions: -

Length, including starting handle, but excluding drawbar - 12 ft. 3½ in.

Width - 5 ft. 9½ in.

Height, with plain road wheels - 6 ft. 5 in.

Fuel tank capacity - 23 gallons.

Air receiver capacity - 9 cu. ft.

Holman Air Compressor, Type T36DD

1. The Holman air compressor, Type T36DD, comprises a two-cylinder two-stage reciprocating air compressor driven by a six-cylinder Dorman diesel engine, Type 6DL3; engine and compressor are mounted together on a four-wheeled chassis.

2. The air receiver is mounted on the rear of the chassis, and six outlet valves are provided, to which can be connected the air-lines serving the components or tools in use.

MT required for transportation -

• Bedford OWL or Dodge 101 or 121

This item of equipment appears to have been added to the 2nd Edition by the issue of AL17.

Engine - Dorman, Type 6DL3, 6 cylinder, water cooled, Diesel engine:  Capacity - 12.21 litres (745.1 cu in): 

Compressor - Holman Type T36, Reciprocating, 2-cylinder two stage with intercooler between stages.

Normal (Max) operating speed - 1,000 rpm

Free air delivery at normal speed - 360 cu ft

Free air delivery at 100 PSI - 305 cu ft

Maximum continuous air pressure - 125 PSI

Intercooler pressure - 29 PSI

Weight - 9,700 lb.

Overall dimensions: -

• Length - 14 ft. 0 in.

• Width - 5 ft. 7 in.

• Height - 6 ft. 5 in.

Fuel tank capacity - 34 gallons.

Holman Air Compressor, Type T25PM

1. The Holman air compressor, Type T25PM, comprises a two-cylinder two-stage reciprocating air compressor driven by a six-cylinder Meadows gasoline engine, Type 6EX/A; engine and compressor are mounted together on a four-wheeled chassis.

2. The air receiver is mounted on the rear of the chassis and six outlet valves are provided, to which can be connected the air-lines serving the components or tools in use.

MT required for transportation -

• Bedford QL, Crossley IGL or Thornycroft 4x4

This item of equipment appears to have been added to the 2nd Edition by the issue of AL17.

Engine - Meadows, Type 6EX/A, 6 cylinder, water cooled, petrol engine:  Capacity - 9.5 litres (579.5 cu in):  BHP - 120 at 2,000 rpm

Compressor - Holman Type T25, Reciprocating, 2-cylinder two stage with intercooler between stages.

Normal (Max) operating speed - 1,000 rpm

Free air delivery at 1,000 rpm and 100 PSI - 207 cu ft

Maximum continuous air pressure - 125 PSI

Intercooler pressure - 29 PSI

Weight - 7,400 lb.

Overall dimensions: -

• Length - 12 ft. 6 in.

• Width - 5 ft. 7 in.

• Height - 6 ft. 8 in.

Fuel tank capacity - 23 gallons.

Schramm air compressor, Type 315

1. The Schramm Air Compressor provides 315 cu. ft. of air per minute at a pressure of 200 lb. per sq. in. for the operation of pneumatic drills, paving breakers, jack hammers and similar equipment.  The plant is fully mobile, being mounted on an Eagle 5-ton trailer, and may be towed for considerable distances at speeds up to 20 mph.

2. The engine and compressor are both six-cylinder units of very similar appearance, coupled together through a manually-operated clutch, and sharing a common water cooling system.

3. The International UD 18 is a compression ignition engine, having a variable compression ratio to enable it to be started and run for short warming-up periods on gasoline, a magneto and carburettor of usual design being provided.  After one or two minutes idling, the gasoline is turned off, and the variable compression control shuts off a pocket in each combustion chamber, thereby masking the sparking plugs and carburettor, and increasing the compression ratio from a gasoline value of approximately 5 to 1 to the diesel ratio of approximately 15 to 1.

MT required for transportation -

• Bedford OWL, OWST or similar

• Hands or Templewood trailer

This item of equipment appears to have been added to the 2nd Edition by the issue of AL28.

Engine - International, Type UD18, 6 cylinder, water cooled, Diesel engine:  Capacity - 691 cu in: 

Compressor - Schramm, Reciprocating, 6-cylinder, single stage, water cooled  Swept volume - 707 cu in

Operating speed - 1,800 rpm

Delivery at 200 PSI - 315 cu ft/min

Maximum continuous air pressure - 200 PSI

Weight (dry) - 5 tons

Overall dimensions: -

• Length - 22 ft. 9 in.

• Width - 7 ft. 5¾ in.

• Height - 7 ft. 0 in.

Fuel tank capacity - 40 US gallons.

Air Pumps air compressor, 113 CFM (lorry mounted), Type TS20

1. The air compressor is designed to supply power for working a variety of pneumatic tools.  The compressor is capable of being moved from site to site as it is mounted on a Morris, 15 cwt., 4 x 4, lorry.  Power for the operation of the compressor is supplied by the engine of the prime-mover, through the medium of a power take-off driven direct from the gearbox main shaft.

This item of equipment appears to have been added to the 2nd Edition by the issue of AL44.

Engine - Morris, 6 cylinder, water cooled, petrol engine:  BHP - 37 at 1,500 rpm

Cylinders - 2

Cylinder bore    

• Low pressure - 8 in.

• High  pressure - 4½ in

Stroke - 4½ in.

Piston displacement (cu. ft. per min) - 56

Delivery of free air per minute, at normal temperatures and pressures, not less than - 113 cu. ft.

BHP absorbed - 32

RPM - 1,200

Working pressure

• Low pressure - 30 lb per  sq. in.

• High pressure - 100 lb per sq. in.

Oil relief valve setting - 15 to 20 lb per sq. in.

Unloader, normal settings   

• Cuts off air supply at - 100 lb per sq. in.

• Cuts in air supply at - 80 lb per sq. in.

Intercooler relief valve set for - 35 lb per sq. in.

Receiver base safety valve set for - 110 lb per sq. in.

Make and type - Morris, 15 cwt. 4 x 4, lorry

Weight (dry) - 7,840 lb

Overall dimensions: -

• Length - 13 ft. 4 in.

• Width - 6 ft. 8 in.

• Height (canopy up)- 6 ft. 3 in.

• Height (canopy down, to top of air cleaner) - 4 ft. 11 in.

• Wheelbase - 8 ft 2 in

• Track - 5 ft 3 in (front), 5 ft 0 in (rear)

• Ground Clearance (rear axle) - 10 in

Air Pumps air compressor 105 cfm, (lorry mounted), Model D130

1. The air compressor is designed to supply air power for operating a variety of pneumatic tools.  Power for operating the compressor is supplied by a Perkins C.I. engine Type PG6.

2. The compressor is mounted on the chassis frame of a Bedford QL lorry and is thus capable of moving from site to site.

This item of equipment appears to have been added to the 2nd Edition by the issue of AL47.

Cylinders - 2

Cylinder bore    

• Low pressure - 7¼ in.

• High  pressure - 4¼ in

Stroke - 4½ in.

Piston displacement (cu. ft. per min) - 130

Delivery of free air per minute, at normal temperatures and pressures, not less than - 105 cu. ft.

BHP absorbed -

• 47 at 12 hr rating

• 42 at 24 hr rating

RPM - 1,350

Working pressure

• Low pressure - 30 lb per  sq. in.

• High pressure - 100 lb per sq. in.

Oil relief valve setting - 15 to 20 lb per sq. in.

Unloader, normal settings   

• Cuts off air supply at - 100 lb per sq. in.

• Cuts in air supply at - 80 lb per sq. in.

Intercooler relief valve set for - 35 lb per sq. in.

Receiver base safety valve set for - 110 lb per sq. in.

Weight of compressor - 1 ton 12 cwt

Overall dimensions: -

• Length - 10 ft. 0 in.

• Width - 4 ft. 9 in.

• Height - 4 ft. 8 in.

Suspension - Front and rear - Semi-elliptic, with hydraulic shock absorbers

Brakes                 

• Foot - Hydraulic vacuum servo assisted  operating on all wheels     

• Hand - Mechanical on rear wheels   

 Steering - Worm and sector 

Wheels - 6.00 x 20, W D divided type 

Tyres - Front and rear: 10.50-20, cross-country      

Make and type - Bedford, Type QL, 3 ton cwt. 4 x 4, lorry

Clutch - Single dry plate, 10 in dia.

Gear boxes

• Main - 4 forward speed, 1 reverse

• Auxiliary - 2 speeds

Gear ratios 

•       Main - 1st -7.22 to 1, 2nd - 3.47 to 1, 3rd - 1.71 to 1, 4th - 1.0 to 1, reverse 7.15 to 1

•       Auxiliary - High gear 1.185 to 1, low gear 2.292 to 1    

Axles

• Front and rear - Fully floating, spiral bevel drive.     Gear ratio 6.16 to 1    

Overall gear ratios

Engine - Bedford, 6 cylinder, water-cooled, petrol:  Capacity - 3.518 litres (214.7 cu, in.):  Compression ratio - 6.22 to 1:  BHP - 72 at 3000 rpm (governed)

Maximum torque - 1,944 lb in at 1,200 rpm 

 MPG - 8    

Radius of action - 224 miles 

Cab - Fully enclosed, steel panelled cab, seating driver and one passenger.  Sliding panel in rear bulkhead.

Overall dimensions: -

• Length - 19 ft. 7¾ in.

• Width - 7 ft. 0 in.

• Height - 7 ft. 9 in.

• Wheelbase - 11 ft 11 in

• Track - 5 ft 8 in (front), 5 ft 6½ in (rear)

• Ground Clearance (rear axle) - 1 ft (laden)

• Turning circle - 54 ft 0 in

• Volume - 1,066 cu ft

Armstrong Whitworth pneumatic saw, Type PS-12

1. The Armstrong Whitworth pneumatic saw, Type PS-12, consists of a rotary air motor of the moving vane type, driving a 12 in. circular saw blade through a worm reduction gear.  The motor is controlled by a trigger throttle fitted in a pistol grip handle; a safety catch is fitted to prevent accidental operation of the throttle.  A governor is fitted to prevent overspeeding during no-load conditions or light-load conditions.

2. An adjustable foot fitted to the tool permits the depth and the angle of the cut to be pre-set, within limits, by the operator.  The combination cross-cut and rip saw blade is protected by a metal guard; the spring-loaded lower half retracts into the upper half when the blade is brought into contact with the material to be cut.  The blade fitted to the tool is suitable for the general-purpose cutting of all varieties of timber.

3. The air supply to the tool must be capable of delivering 75 cu. ft. of free air at 90 lb. per sq. in. at the connection to the tool.

This item of equipment appears to have been added to the 2nd Edition by the issue of AL53.

Machine Capacity

• Depth of cut (vertical) - 2-3/8 to 4-3/8 adjustable

• Angle of cut - 45 deg to 90 deg adjustable

Governed speed - 1,200 rpm

Blade diameter - 12 in

Overall Dimensions: -   

• Length - 22 in  

• Width - 8 in.

• Height - 14½ in

Weight - 30 lb

Broomwade air compressor, 210 cfm, Model SV245

1. The Broomwade SV245 portable air compressor consists of a trailer-mounted unit containing a 4-cylinder compressor driven through a hand-operated clutch by a 6-cylinder diesel engine.

2. The trailer chassis is mounted on two axles fitted with pneumatic-tyred wheels Girling brakes are fitted to the rear wheels and are cable-operated from the spring-loaded tow-eye by override action; a parking brake lever is mounted on the draw bar.

3. A radiator, fitted at the front end of the chassis, cools the water for the cooling systems of the engine and the compressor.

This item of equipment appears to have been added to the 2nd Edition by the issue of AL67.

Engine - Gardner, 6LW, 6 cylinder, OHV, water cooled, Diesel engine:  Capacity - 9.5 litres (579.5 cu in):  BHP - 112 at 1,700 rpm

Compressor - Broomwade, Model SV245, Sleeve-valve, single-acting, V4, 2 blocks, water cooled.

Max. safe towing speed - 30 m.p.h.

Min. dia. turning circle - 41 ft.

Air output - 210 cu. ft. per min.

Air pressure - 100 lb. per sq. in.

Air delivery connections - 6 delivery cocks, each ¾ in. BSP.

Overall dimensions: -

• Length with draw bar in towing position - 16 ft. 3 in.

• Length with draw bar raised - 11ft. 10 in.

• Height (top of silencer) - 6 ft. 8 in.

• Width - 5 ft. 8 in.

• Minimum ground clearance (rear axle spring clamping bolts - 11 in

• Ground  clearance of tool compartment - 12 in

• Overhang, tool compartment to rear wheel - 1 ft 5 in

• Wheelbase - 7 ft. 4 in

• Wheel track centres (front and rear) - 4 ft. 9 in

Weights  

• Total weight with tanks and cooling system empty - 2 ton 17¾ cwt.

• Front axle loading - 1 ton 2 cwt.

• Rear axle loading - 1 ton 15¾ cwt

Bristol air compressor, 105 cfm (trailer mounted), Type ATS 138 PD

1. The unit described here is a portable compressor consisting of an air cooled, two-stage compressor, driven through a hand operated clutch by a six cylinder diesel engine; unit is mounted on a two wheeled trailer fitted with pneumatic tyres,

2. Two adjustable legs, fitted to the trailer chassis, are retracted when the trailer is being towed, or are adjusted to support the chassis in the operating position when it is not connected to a towing vehicle.

3. Girling brakes are fitted to the wheels. When the trailer is being towed, the brakes are operated by the over-run action of the spring loaded tow-eye.  A hand brake lever, mounted on the drawbar, is coupled to the brakes to enable them to be used as parking brakes.

4. A radiator for the diesel engine cooling system is mounted on the rear end of the chassis; an air receiver and the diesel engine fuel tank are mounted on the front end of the chassis.

MT required for transportation -

• Towed by 3 ton Tipper or similar

This item of equipment appears to have been added to the 2nd Edition by the issue of AL68.

Engine - Perkins, P6, 6 cylinder, OHV, water cooled, Diesel engine:  BHP - 39 at 1,200 rpm

Compressor - Bristol, 2-stage, V2, air cooled.

Max. safe towing speed - 20 m.p.h.

Compressor displacement - 138 cu. ft. per min

Delivery of free air, at normal temperatures and pressures - 105 cu ft per min

Normal pressure - 100 lb. per sq. in.

Air delivery connections - 4 x ¾ in. BSP spring-loaded cocks

Overall dimensions: -

• Length with draw bar fitted - 11 ft. 7 in.

• Length with draw bar removed for stowage - 9 ft. 3 in.

• Height (top of silencer) - 5 ft. 11 in.

• Width - 5 ft. 10 in.

• Wheel track centres (front and rear) - 5 ft. 0 in

• Height of drawbar with chassis in horizonta1 position - 2 ft. 2 in.

• Ground clearance (axle and battery boxes) - 12 in.

• Ground clearance of legs (retracted) - 8 in.

Weights

• Total weight fully equipped with radiator and tanks full - 34 cwt.

• With tanks and radiator empty - 32 cwt.

Climax air compressor, 315 cfm, Model F 80CX (Truck mounted)

1. The equipment is a self-contained mobile unit composed of a diesel engine driven compressor unit together with special stowages, containing a range of pneumatic tools and hoses, mounted on a Bedford, Type R, 3 ton, 4 x 4 chassis.  The unit is designed for use in conjunction with other facilities, repair of runways, taxiways, and for the rapid other vital areas, after damage by enemy action.

2. The ancillary equipment listed in the data below, is based on normal requirements for these duties; other types and sizes of equipment are available and may be used as alternative or additional items to meet special requirements, but the scale of equipment of the machine must not be changed without Air Ministry W(A.C.B.) authority.

This item of equipment appears to have been added to the 2nd Edition by the issue of AL73.

Compressor - Climax F.80CX        

Type - Reciprocating, single acting, two-stage         

Cylinders - 6 (4 low pressure, 2 high pressure)     

Displacement - 394 cu, ft. per min.   

Horse power at compressor shaft - 80, with full compressor output at standard temperature and pressure    .

Cooling - Air      

Speed - 1,440 rpm.  

Clutch - Anderton, hand-operated plate          

Air receiver - Farrar fusion welded

Compressor

Free air delivery - 315 cu, ft. per min

Pressure - 100 lb. per sq. in.

Capacity of air receiver - 13 cu. ft

Temperature of air entering receiver (deg F above ambient) - 280 deg. F.

Type of unloader - Suction type

• Cutting in pressure - 80 lb. per sq. in.

• Cutting out pressure - 100 lb. per sq. in

Air delivery connections - 8 (4 at each end of air receiver)

Truck

Turning circle (dia) - 60 ft.

Travelling speeds - see AP2782A

Overall dimensions: -

• Length - 20 ft. 10 in

• Width - 7 ft. 8 in.

• Height - 8 ft. 8 in.

• Wheelbase - 13 ft.

• Track

  • Front -  6 ft. 1-1/8 in.

  • Rear - 6 ft. I in.

• Overhang

  • Rear of truck to rear wheel centre - 4 ft.

  • Front of truck to front wheel centre - 3 ft. 10 in

Weights (machine fully equipped)

• Front axle loading - 3 ton 9 cwt

• Rear axle loading -4 ton 6¾ cwt

• Total weight - 7 ton 15¾ cwt

Air Pumps air compressor 105 cfm, Model D 130 (trailer mounted)

1. The compressor is an air cooled two-stage air compressor driven by a Perkins PG.6 diesel engine through a hand-operated clutch,  The engine and compressor are mounted in line on a two wheeled, pneumatic tyred trailer.

2. An intercooler is fitted between the two stages of the air compression, and cooling is effected by a fan driven by V-belts from the compressor shaft.  The free air output is governed by a constant speed unloader which automatically closes and opens the suction of the compressor, according to the air demand.

3. The trailer is equipped with brakes operated by the draw bar, on the over-run principle, and a hand lever is fitted to the draw bar to enable the brakes to be applied for parking.

Stores Ref - 89E/41

MT required for transportation -

• Suitable for towing at speeds of up to 20 mph

This item of equipment appears to have been added to the 2nd Edition by the issue of AL85.

Engine - Perkins, PG 6, 6 cylinder, OHV, water cooled, Diesel engine:  BHP - 42 at 1,350 rpm (governed)

Compressor - Air Pumps, Model D130, 2-stage, 90 deg V2, air cooled with intercooler.

Piston displacement - 130 cfm at 1,350 rpm.

Free air delivered (100 lb. per sq. in. gauge sea level) - 105 cfm. at 1,350 rpm.

Working pressure (unloader setting)

• Cut-out pressure - 100 lb. per sq. in.

• Cut-in pressure -  80 lb. per sq. in.

Temperature of air at delivery manifold - Not more than 250 (leg. above ambient

Air delivery connections - Four (two on each side of the air receiver tank)

Overall dimensions: -

• Length - 11 ft. 6 in.

• Width - 6 ft. 0 in

• Height - 6 ft. 3 in

• Wheel track centres - 5 ft. 0 in

• Height of drawbar with chassis in horizonta1 position - 2 ft. 3 in.

• Ground clearance under steadying jacks (retracted) - 9 in.

Weight (unladen) - 2 tons 0½ cwt

Ingersoll-Rand, Jackbit Grinder, Type JA3

1. The grinder is a machine on which all grinding operations for the reconditioning of detachable rock drill bits may be performed. Complete equipment for re-sharpening used bits and for grinding them to the next smaller gauge size is included.

2. A settling tank, coolant tank and coolant pump, together with the piping necessary to carry the coolant to the working faces of the wheels, are all mounted on a structural steel frame.

3. The power is supplied by any standard air compressor, which in turn drives an air motor, governed to maintain the maximum safe speed for the grinding wheels used.

MT required for transportation -

• Bedford OWST

This entry has been updated to AL33.

The jackbit grinder is operated by one man and all ordinary types of bits can be ground by the adjustments provided.

Speed - Governed to 1,900 rpm free speed

Direction of rotation - Counter-clockwise when facing gauge wheel.

Coolant - 1 part soluble cutting oil ZX-1 and 40 parts water.

Adjustments for various sizes of bits

• Gauging head - Can be set to grind clearance angles of up to about 15 deg on the bit.
• Forming wheel dresser head - Can be set to produce angles of from 0 deg to 45 deg on the forming wheel

Grinding wheels and pump drives - Belt

Grinding wheels - 12 in x 1¼ in to 3 in

Weight - 1,020 lb.

Overall dimensions: -

• Length - 4 ft 6 in.

• Width - 3 ft 5 in.

• Height - 4 ft 10 in in.

Le Tourneau Heavy Duty Rooter, Model K30

1. This rooter is used to break up hard and frozen ground to render it suitable for the use of scrapers, for breaking up pavements and roads and also for ripping out tree stumps, boulders and other objects embedded in the ground.

2. The rooter consists of a T-shaped main frame with a trunnion shaft on which is pivoted a throw arm.  Wheels are mounted on the lower end of the throw arm; the forward end of the main frame is linked to the towing tractor by a universal coupling and the rear end of the main, frame carries the shanks which penetrate into the ground.

3. The height of the shanks which determines the depth of penetration is controlled by a cable passing through sheaves on the upper end of the throw arm and on the main frame.  The normal depth that the shanks will penetrate is 30 in.  The cable is connected to a power control unit on the towing tractor.

4. A bumper pad is fitted to the rear of the rooter so that in exceptionally bad soil conditions extra power may be obtained by using another Class I tractor to push

MT required for transportation -

• Hands or Templewood trailer (for transportation)

• Class I, Tractor (for Towing)

This entry has been amended to AL13.

The power control unit on the tractor controls, by single wire cable, the digging depth and the lifting of the rooter teeth out of the ground.  If necessary, "lift and pull" can be employed simultaneously to uproot large boulders or break up concrete slabs.  The teeth are set at a forward angle and to break up concrete the correct method is to get the teeth under the slab and pull the rooter and lift the teeth at the same time.  This breaks off the slab in large pieces, the wheels acting as a fulcrum.

For clearing brush and bushes the rooter can be used in conjunction with a tractor fitted with angledozer blade.  The tractor moves forward clearing the brush with the angledozer blade and at the same time towing the rooter which removes buried roots.

It is important to note that the rooter should be used with its teeth fully embedded in the ground, but no attempt must be made to turn the tractor until the teeth have been withdrawn.

Number of shanks - 3.

Depth of penetration - 30 in.

Approximate weight - 14,560 lb.

Overall dimensions: -   

• Length - 20 ft. 0 in     

• Width - 8 ft. 0 in.

• Height - 8 ft. 6 in

Le Tourneau Light Duty Rooter, Model H3

1. This rooter is used to break up hard and frozen ground to make it suitable for the use of scrapers, for breaking up pavements and roads and also for ripping out tree stumps, boulders and other objects embedded in the ground.

2. The rooter consists of a T-shaped main frame with a trunnion shaft on which is pivoted a throw arm.  Wheels are mounted on the lower end of the throw arm; the forward end of the main frame is linked to the towing tractor by a universal coupling, and the rear end of the main frame carries the shanks which penetrate into the ground.

3. The height of the shanks, which determines the depth of penetration, is controlled by a cable passing through sheaves on the upper end of the throw arm and the main frame.  The normal depth that the shanks will penetrate is 29 in. The cable is connected to a power control unit on the towing tractor.

MT required for transportation -

• Hands or Templewood trailer (for transportation)

• Tractor, Class 1 or 2 (for Towing)

 This item of equipment appears to have been added to the 2nd Edition by the issue of AL13.

Number of shanks - 3.

Depth of penetration - 29 in.

Approximate weight - 7,500 lb.

Overall dimensions: -   

• Length - 17 ft. 0 in     

• Width - 8 ft. 4 in.

• Height - 5 ft. 7 in

Armstrong Whitworth pneumatic clay digger

1. The Armstrong Whitworth clay digger is a pneumatic percussive tool fitted with a hardened steel blade for excavating in stiff clay or similar material.

2. Owing to its comparatively small size, the tool is very suitable for use in trench and tunnelling work where the use of larger equipment would be impracticable.

3. The motor is of the valveless type in which operation is effected by the differential action of the air pressure acting on the opposing faces of a stepped piston.

4. The air supply to the tool must be capable of supplying 28 cu. ft. of free air per minute, at 90 lb. per sq. in. pressure, at the tool.

 This item of equipment appears to have been added to the 2nd Edition by the issue of AL64.

Makers designation - Size No. 424 Clay Digger

Blade shank size - Hexagon 0.882 in. across flats (1.027 in. round) x 3.25 in. long with 1.625 in. dia. x 0.5 in. deep collar

Weight - 22¼ lb. (less blade)

Overall dimensions: -   

• Length (with new blade) - 2 ft. 8½ in     

• Length (less blade) - 17¼ in     

• Width (in line with handle) - 7½ in.

• Width (across  handle flange) - 4½ in.

• Bore - 1-7/8 in

• Stroke - 2½ in

• Air adapter - ¾ in BSP

Drill, wagon mounted, Ingersoll-Rand Model FM2

1. The plant consists of a one-piece tubular frame on which are mounted a drill and a feed motor.  It is designed for vertical, horizontal and angular drilling. The rear wheels can be swivelled through 90 deg. for line-hole drilling; lateral adjustment is provided for using the plant on uneven or sloping ground.  The drill will accommodate 6 ft. steel changes for holes up to 24 ft. in depth. It has a heavy piston with a long stroke.

2. The power is supplied by any standard air compressor, which in turn drives, a four-cylinder air motor thus providing a wide range of feeding pressure from 0 to 1,000 lb The air motor is directly connected and is fitted with a self-locking worm drive which prevents the drill from jumping back thus eliminating the use of unnecessary feeding pressure

MT required for transportation -

• Bedford OWST or similar tipping tender

 This item of equipment appears to have been added to the 2nd Edition by the issue of AL17.

Machine

• Diameter of rear wheels - 2 ft 6 in

• Diameter of front wheel - 1 ft 4 in

• Method of steering - Hand-operated tow-bar

• Method of jacking - Adjustable steel anchor legs

• Drill head - Ingersoll-Rand X-71WD

• Feed motor - Ingersoll-Rand 132 FM2

Operating Data.

• Operating pressure - Variable

• Length of feed - 7 ft 0 in

• Maximum travel of feed - 8 ft 8½ in

• Maximum depth of hole - 24 ft

• Type of drilling - Vertical, line hole, toe holes, breast holes and on uneven ground.

Dimensions: -   

• Overall Length - 7 ft. 4 in     

• Length (wheel centres) - 5 ft. 6 in     

• Width - 5 ft. 9 in.

• Height (max) - 11 ft. 9½ in

Weight - 1,500 lb

Warsop road breaker, Type S6

1. The Warsop road breaker, Type S6, is a self-contained gasoline-engine-powered road drill suitable for breaking up concrete, macadam, asphalt or other surfaces; it can also be used to a limited extent for rock breaking.

2. Several different tools are available for use with the machine, including a diamond point steel, chisel point steel, asphalt cutter, clay spade, rammer foot, pile-driving attachment and ice-breaking tool.  Most of these tools are available in various lengths, and can often be heated and reformed if breakage occurs.

This item of equipment appears to have been added to the 2nd Edition by the issue of AL17.

Machine

• Tool shank size - 1-1/8 in hexagon x 5-1/8 in long with 1¾ in dia x ½ in deep collar

Engine.

• Villiers, No 784, single cylinder, air-cooled, petrol engine:  Capacity - 249 cc:  Operating speed - 2,200 rpm

Dimensions: -   

• Length (without steel) - 2 ft. 9 in     

• Width (over handlebars) - 1 ft. 2 in.

• Depth (front of machine to knee guard) - 1 ft. 1 in

Weight - 93 lb (less steel and fuel)

Benoto machine, Type Genie 1950

1. The Benoto machine is a percussion type drill, power for its operation being supplied by a Renault four cylinder gasoline engine.

2. The drilling is accomplished by dropping a hammer grab on to the place where the hole required.  The hammer-grab is raised by a winch through the medium of a wire rope

3. The machine should be moved from site to site is as a towed vehicle.

This item of equipment appears to have been added to the 2nd Edition by the issue of AL46.

Running gear - Four pneumatic tyred wheels

Tyres - 270 x 20

Winch - Free fall, cone clutch, automatic internal brake.

• Controls - One single lever

• Capacity at capstan head - 606¼ lb

Dimensions: -   

• Length (mast not erected) - 14 ft. 1¼ in     

• Length (mast erected) - 15 ft. 9 in     

• Width - 8 ft. 2-5/8 in.

• Height (mast not erected) - 10 ft. 8 in

• Height (mast erected) - 17 ft. 2-7/16 in

• Wheelbase - 9 ft 9-7/16 in

• Ground Clearance - 1 ft 3-7/16 in

• Minimum turning radius - 14 ft 9 in

Weight - 5 ton 16 cwt (without personnel)

Drill, tripod mounted, Ingersoll-Rand, Model X-71

1. The plant consists of a tripod and frame on which are mounted a drill and an air motor.   It is designed for drilling and broaching.  The drill will accommodate 6 ft. steel changes for holes up to 24 ft. depth.

2. The power for operating the plant is supplied by any standard air compressor, which in turn drives the air motor which rotates the drill.  The equipment is fitted with a handcrank for providing the feeding pressure.

This item of equipment appears to have been added to the 2nd Edition by the issue of AL50.

Operating pressure - Variable

Length of feed (nominal) - 7 ft 0 in

Maximum travel of feed - 8 ft 8½ in

Maximum depth of hole - 24 ft

Dimensions (tripod legs not extended): -   

• Length - 4 ft. 0 in     

• Width - 3 ft. 3 in.

• Height - 6 ft. 8 in

Armstrong Whitworth pneumatic paving breaker (Medium)

1. The Armstrong Whitworth paving breaker is a pneumatic percussive tool, of the disc valve type fitted with a steel pick having a hardened point for breaking up hard materials.

2. The air supply to the tool must be capable of supplying 50 cu. ft. of free air per minute 90 lb per sq in pressure at the tool.

This item of equipment appears to have been added to the 2nd Edition by the issue of AL64.

Makers designation - 70 lb class paving breaker, Size No 139

Pick shank size - Hexagon 1.125 in. across flats (1.299 in. round) x 6 in. long with 1.7 in. dia. x 0.625 in. deep collar

Weight - 74 lb. (less pick)

Overall dimensions: -   

• Length (with new pick) - 3 ft. 7½ in     

• Length (less blade) - 2 ft 4 in     

• Bore - 2-1/8 in

• Stroke - 5 in

• Air adapter - ¾ in BSP

Armstrong Whitworth pneumatic paving breaker (Medium)

1. The Armstrong Whitworth paving breaker is a pneumatic percussive tool, of the disc valve type fitted with a steel pick having a hardened point for breaking up hard materials.

2. The air supply to the tool must be capable of supplying 50 cu. ft. of free air per minute 90 lb per sq in pressure at the tool.

This item of equipment appears to have been added to the 2nd Edition by the issue of AL64.

Makers designation - 70 lb class paving breaker, Size No 139

Pick shank size - Hexagon 1.125 in. across flats (1.299 in. round) x 6 in. long with 1.7 in. dia. x 0.625 in. deep collar

Weight - 74 lb. (less pick)

Overall dimensions: -   

• Length (with new pick) - 3 ft. 7½ in     

• Length (less blade) - 2 ft 4 in     

• Bore - 2-1/8 in

• Stroke - 5 in

• Air adapter - ¾ in BSP

Climax jackhammer rock drill, RV 237/1

1. The Climax hand hammer rock drill is a dry type of pneumatic tool designed for perforating rock or similar material by a combined percussive and rotary action

2. The air supply to the tool must be sufficient to maintain a pressure of 80 lb per sq. in at a maximum consumption of 85 cu. ft. of free air per minute.

This item of equipment appears to have been added to the 2nd Edition by the issue of AL67 and was moved to Part 8, Section 3 by AL73).

Makers designation - Climax Type RV237 (dry)

Drill shank size: -

• Hexagon 7/8 in. across flats (1.01 in. across corners)

• Length - 3¼ in.

• Collar 1-3/8 in. dia. x 3/8 in. deep

• Bore at shank end, 5/16 in. dia.

Performance

• Blows per minute

  • 2288 at 80 lb. per sq. in. pressure

  • 1991 at 60 lb. per sq. in. pressure

• Foot pound blow

  • 22 at 80 lb. per sq. in. pressure

  • 17.5 at 60 lb. per sq. in. pressure

Overall dimensions: -   

• Length (without drill steel) - 1 ft. 9 in     

• Cylinder bore - 2¾ in

• Stroke -1¾ in

• Air adapter - ¾ in BSP union (¾ bore hose)

Weight - 33¾ lb. (without drill steel)