The Purchase Department.
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Where to Buy your Supplies.
You Can Get It At " G.J." (Norwood).—The " Mota," forge fan for which pin inquire is made by the Alldays and Onions Pneumatic Engineering Co., Ltd., Birmingham " Works."—The recorder to which you refer is marketed in this country by S. S. Nevill, Ltd., 'Ma, Parkhurst Road, London, N.
The Stewart Speedometer.
A speedometer is a very necessary fitting for the industrial-vehicle user, and his interests are well safeguarded by the adopting of one or another of the many reliable forms now constructed.
One of the best-known types marketed is the Stewart speedometer, manufactured by the CooperStewart Engineering Co., Ltd., 11, Broad Street, Jiloornshury, London, W.C. It is constructed on the magnetic principle, the magnet being made of tungsten steel, which retains its magnetic strength for an indefinite period.
The alloy dial cup is strongly mounted on a polished shaft in exact balance, both ends of the spindle being supported in polished jewel bearings. This construction greatly reduces friction, and permits of a most sensitive adjustment.
The odometer drive is direct, each pinion being machined from a single piece of steel, which is afterwards carefully case-hardened_ A gradient indicator is also included and consists of a metal cylinder mounted on a small steel shaft, the ends of which fit into jewel bearings in the frame work. The drive is by means of flexible shafting built up of hardened steel links, any of which can readily be replaced when found necessary.
The swivel joint which connects the flexible shaft with the road-wheel gear is made from hardened drop forgings of a tough alloy-steel.
A most important feature of the Stewart speedometer is that the magnet is unaffected by temperalure changes, as a compensator is fitted, which renders the speedometer accurate under all working conditions.
A copy of the concern's latest catalogue is to hand, which will be forwarded on application.
Catalogues Received, We have received an interesting booklet entitled 'The Frozen Truth About Welding" from 13arimar, Ltd., 10, Poland Street, Oxford Street, London, W. It contains interesting textual matter and illustrations of several chassis components that have been restored by the Barunar scientific welding process. A copy may he had on application to the company.
We have to hand from the Alldays and Onions Pneumatic Engineering Co., Ltd., a copy of its latest booklet dealing with power hammers, drop stamps, etc. Numerous half-tone and line illustrations are included.
The power hammers made by this concern are the outcome of many years' experience in the manufacture of this class of hammer, which, it is claimed by the makers, possesses all the good points of steam. hammers and is more economical than this type.
Fans Suitable for Office Ventilation.
An ideal type of fan suitable for office and works ventilation is manufactured by Fitters Ventilating and Engineering Co., Ltd., 20, Bishopsgate, London, E.G. These fans, which are called the " Multiblade," are the outcome of consistent experimenting with a view to obtaining a blade curvature which shall displace the maximum amount of air with the minimum of resistance.
The "Multiblade" fan consists of a number of comparatively narrow blades which are arranged one behind the other according to pitch and curving. This has the effect of reducing the resistance, as the air can pass freely through the channels formed by the l.iades of the fan.
The company will be pleased to supply information and give advice on all questions relating to vent'. Mien.