The Supply Department.
Page 19
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Platinum Supplies.
1'. R. 'ro(mAs (East Ham).—There arc very few ;flatinum factors in business in England on a large scale. .111 reput
able jeweller ii 0111(1, of course, be quite willing to procure or you w hateyer quantity you may require, but it would .n all ttrohability be your best plan to get into touch with lohnson, Matthey and Company, Limited, assayers Aild reiners, of7N, Hatton Garden. This company, you will reitember, was the sufferer in the theft of two platinum ingots 'rom a how case at the Franco-British Exhibition a few Avid:. ago. Practically all the platinum which is used for .4ectrical instrument work in London passes through Messrs. lohn,on, Matthey and Company's hands. The London iene.ral Omnibus Company and the General Motor Cab ...:ornpan■ procure from this house a considerable quantity if platinum wire for ignition replacements. The present narket price of the precious aretal is 85s, per ounce.
Staginess Barometers.
The praiseworthy practice of plotting out, on ruled paper, ill he workshop and (Alice data to which const ant reerence is necessary, has now extended to all modern ngineeritig concerns, and far giving at a glance such inormation es the cost of manufacture, output, wages, general .xpenses, porchases, etc., for each day, week, month, or ear, such charts are unequalled. ..kny fluctuations in the Hues n taw materials, ha!ight, or other important factor an be closely followed and their tendencies noted. Our (eiders will, therefore, be interested to know where they av olita:n accurately ruled sheets for the preparat:on of itch graphical records. IV. G. Systems, Limited, of Craven
Kingswav, London, W.C., holds a large stock of hese sheets in a great variety of patterns to suit the reuirements of all trades and professions. The ruled -beets I opaque paper, transparent paper, or tracing cloth are lade up in pads of so sheets.
team Turbine OH Separator.
The eonsumption of cotton waste and cleaning rags in the epets and running sheds of commercial motor-vehicle undertkings reaches a very considerable figure. The appliance, Inch we illustrate, represents a single unit of the class of ig and waste-cleaning plant, of which a large installation as recently been put down at the Farm Lane DepOt of the (nylon Road Car Cornpany, Limited. This class of equip_ tent is handled in this country by Mr. Jean Schmidt, of igh Holborn, W.C. y reference to the ustration it will be en that the separar consists. of a per)ra■ed cage (II) hich is centrally ounted on a ballaring I. N) through vertical shaft (0). te lower edge of Is suspended cage formed with blades
, A) of a turbine ape, and on to th('st: v-pressure steam is mn through the in:tor cock (C). The tam, after it has e its part of
;n-gy by the revolu n of the suspended ze, finds its way up .ough the outer r to rated walls
, B) of the cage, thee through the aerial, which has to Ito cleaned and of which the cage full, and lastly it escapes through the inner jacket (I)) o the exhaust pipe (G). The oily extract falls to the floor the main casing (A) and it is collected in the sump (11, m which it is eventually drawn. Unless a small steam generating plant is available, equipment of this class cannot be economically installed, but, as the company guarantees a saving oh from 5o to 75 per cent. in the consumption of cleaning material employed, it is possible that the promise of such a saving may, in depots and factories where a large quantity of oily rags and waste is habitually discarded, warrant enquiry as to whether such a plant as that described above might not economically be employed to recover both the rags rind the oil.
Modified Pattern of Morse Chain.
L. P. 1.1vcAurvy (Rotherham), S. GREEN (Lowestoft), " CASTI.F.N.W " (Putney) and others.—With reference to a number of enquiries which have reached us with regard to the improved heavy pattern of Westinghouse (Morse) silent chain, which was mentioned in the course of the article on the manufacture of Westinghouse chains in our last issue, we would suggest that our correspondents put themselves into direct communication with the Westinghouse Brake Company, Limited, Morse Chain Department, York Road, King's Cross. The company will, no doubt, be pleased to furnish full particulars with regard to this new type. It must, however, be clearly under stood that the new pattern is merely a modification of the older type and in no way supersedes it. We illustrate a few of the components of this m od ified pattern, roughly assembled in The component parts of the new order to show the re
heavy type of Morse chain. lation of the parts one to the other. It will be seen that all the links now have full teeth. The depth of the tooth itself has been materially increased and this has allowed the cross-sectional area of the pins to be enlarged. It will be remembered that the original chain gripped both faces of one tooth, but, in the modified type, the inner faces of alternate teeth are those on which the tooth bears. The original pattern of chain has done and, no doubt, will continue to do quite good service, and it will lw interesting to watch the comparative performances of the two chains on similar service.
D.W.P. Ban Bearings.
A new catalogue of ball bearings is to hand this week from Ludw. Loewe and Company, of Farringdon Road,
Clerkenwell, E.C. This company is the agent for the D.W.F. ball bearings which are such familiar components on a number of the better-known types of commercial motor vehicles. The new catalogue draws attention to several new patterns of hearing and to the applicatien of bearings of the D.W.F. pattern to a number of new uses. The patterns supplied may be fitted with either a spring type of ball separator, or with a one-piece metal cage; only the conditions under which the bearing is to work can help to decide which method offers the most advantage. The solid cage is recommended, where it is possible to avoid disturbance of the bearing owing to repairs or renewals to other parts of the machine of which the ball bearing is a member. It is often stated in certain quarters that ball bearings, although their adoption is quite good practice for light loads and for moderate speeds, should not be employed where these two conditions are other than moderate. It may be news to such critics that the examples of the particular type of bearing, which we are now considering, have been for years running at speeds up to 14,00cor.p.m., and we are informed that it is no uncommon thing in Germany to employ them for the bearings of flywheels, whose weight may reach as much as r5 tons. The new catalogue gives a deal of useful information and data to the designer and user of ballbearing machinery.