The Purchase Department.
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Where to Buy your Supplies.
You Can Get It At " K.M." (Birminghtun).—The "F. and S." ball bearings are marketed by the Tormo Manufacturing Co., 67-68, Bunhill Row, London, E.G.
'• W.Y." (Stroud Green).—The " Kolek " lock washers ire made by the Positive Lock Washers Co., 48-52, James Watt Street, Glasgow.
Catalogues Received.
In the latest catalogue, issued by S. Wolf and Co., Ltd., 115, Southwark Street, London, S.E., there is included a number of practical hints on the fitting and care of the U.H. waterproof magneto. This pamphlet is well printed, and the textual matter and numerous explanatory illustrations serve well to indicate the good points of this particular type of
acCCSSOry.
We have received a copy of the latest booklet issued by the Vacuum Oil Co., Ltd., Claxton House, Westminster, London, S.W. This describes fully the different grades of mobiloils and greases as manic factured by this concern and the particular uses for which they are suited. The company will be pleased to send a copy of this booklet to those inter ested.
Carbon Removing with Oxygen.
The use of oxygen for the removal of carbon deposit from the cylinders of internal-combustion engines is a method of which but little advantage has hitherto been taken in this country. It is, however, geeerally recognized that the oxygen-process of removing carbon deposit is usually the most effectual. It certainly possesses advantages over many mechanical means employed, in that the whole of the combustion chamber is ensured proper treatment.
The Cox Manufacturing Co., Ltd., 135, Wellington Street, Glasgow, is one of the best known makers of this class of plant. The Cox apparatus is a scientifically constructed and safe machine which, it is claimed, is economical in its working and can be operated by any unpractised person. The oXygen utilized is contained in a cylinder: and is carried to the sparking-plug opening of the engine by means of a flexible tube. A nozzle is fitted provided with means for regulating the pressure of gas. The company claims that the best results are obtained by directing a constant supply of oxygen at a fixed pressure ; the regulator fitted provides for this. The gas is ignited by means of a lighted taper, the carbon, being made ineaedescent, forms carbon-dioxide gas, which naturally escapes through the aperture of the cylinder
In practice it is found that the rise of temperature occasioned by the combustion of the cu hoc is not harmful to the casting. This is due. to the constant flow of oxygen from the gas cylinder, the temperature of which, through expansion, is eonsidei ably lower thau that of the atmosphere. The makers !mint out that the mere introduction of oxygen into the cylinder will not afford the desired result, it being most essential that the supply of gas be constant at a. fixed pressure to suit the paitieular size of combustion space undergoing treatinent.
The Cox device should prove eminently suitable for garages and establishments employing industrial motors, as the vehicles can be attended to w ith the minimum of labour and delay. The Jones Speedometer and Log Recorder.
The automobile specialities handled by Markt and Co. (London), Ltd., DS and 100, Clerkenwell Road, London, E C., are well known throughout the industry. Probably one of the most familiar is the Jones speedometer, which Is finding considerable favour amongst users of commercial vehicles. There are few parts in the Jones device and even these are very simple. The speedometer can be driven from the front road-wheels by gear or by pulley and belt from the cardan or propOler shaft, or from the chain shaft in the case of chain-driven vehicles. Every recorder is calibrated by expert instrument makers, The speedometer can be supplied in combination with a log recorder. This provides a very simple and ingenious method of keeping a record of the machine's movements during the days run.
The recorder contains high-grade mechanism which operates the chart and causes it to make a complete revolution twice in a day of 24 hours. The graph
mechanism or marking pencil is governed entirely by the speedometer driving gear, and operates only when the vehicle is in motion.
The motion is a simple backward and forward movement corresponding to the Ppeed of the vehicle. If the speed be accelerated, the movement will be correspondingly increased, with the result that the markings on the chart will appear closer, while as the speed of the machine is decreased the markings will be more open. This is shown in the illustration we reproduce herewith. While the vehicle is standing still the marking pencil remains stationary, but the chart continues to revolve on the drum at a constant speed, the result being a plain circular line on the chart which corresponds to the time during which the vehicle is standing The Jones recorder, it will he seen, produces a errtain record of all movements of the vehicle, both while running and stationary. It also affords a record of how long it stopped. hew for it ran before !t, stopped, and how fast it ran. This class of accessory should prove useful to owners of indlistvial vehicles who wish to have a record of the workings of their machines, and something in addition to the evidence afforded by a speedometer.