New Equipment for the Service Depot A MOBILE compressor having a
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'displacement of 13.6 cubic ft. per minute, and with a working pressure of 100. lb. per-sq. in., has recently been added to the range made, by the y ma tic Engineering Co., Ltd., Redditch, Worcester. This compressor can be supplied with either an electric motor or petrol engine. In the case of the former, the motor is rated at 2 h.p., and with petrol power the engine provided is a J.A.P. 4 h.p. unit.
The compressor, which is of-the twincylindered type, is directly coupled to the power plant.
It has roller big-end bearings and the crankshaft runs on white-metal-lined gunmetal bearings. Pressure lubrication
is employed, the oil sump having a capacity of 2,3,pints.
A standard fitting on this item of equipment is the Hymatic-R.5.0 rectifierand reducing valve. The rectifier has a. high separation factor, and the pressurereducing valve is both sensitive and stable. This outfit is particularly suited to the operation of pneumatic tools in which it is essential that the air supply be clean and free from moisture,
The electrically driven model is known as HMS 11, and running at 1,440 r.p.m. has an output of 11 cubic ft. per minute. In the case of the petrol.engined compressor, known as the HMS 12, the speed is 1,800 r.p.m. and the output 13.6 cubic ft. per minute.
The air receiver is standard on both types and has a capacity of 11 gallons of air, or 8 gallons in the case of liquids.
Users of the H.E. heavy-duty salvage crane, made by Harvey Frost and Co., Ltd., of Bishop's Stortford, will no doubt be interested in a useful addition to this piece of equipment. This takes the form Of a fitment for use in conjunction with the front or middle winch for rotating the crane on its turntable.
By anchoring the winch cable to eyebolts fitted to the floor of the vehicle, the crane can be stewed in a clockwise or anti-clockwise direction as may be required. This method is much more convenient than levering with the rear supporting jack.