The Supply Department.
Page 23
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Selected Information which is likely to be of laterest to Makers, Owners, and their Buyers.
ad Bar.
S.P. (Hounslow).—The probability is that the round steel ir which you purchased had a "bad " centre, due ro caress rolling. It is unwise, unless you are very sure what su are doing, to buy bar from little-known sources. Except I the highest grade material, the centres of large bars Haub] not be trusted implicitly.
aIzell Steel.
1,U('ILS MEEN (Westminster).--The Dalzell steel about hich you enquire, is made by David Colville and Sons, imited, of Motherwell, Scotland. Yes, there is a London Tice at 54, Old Broad Street, E.C. Iron and steel bar of Try section likely to be required is stocked, but we doubt the small amount that you use could not be bought more invenieraly in London at one of several engineers' general
ores. 11 " " definitely specified?
he Lighting of Garages.
Some form of electric lighting is necessary in all garagt.s hich house motor vehicles that are driven by in ternalmbustion engines, and illumination by gas has little to commend it even for repair and general workshops er for trages where steam-driven vehicles are stored. The ringent regulations of the fire-insurance offices necessite the following of very careful precautions in the planning id installation of electric-light systems for this class of Drk, and in most cases the absence of naked lights is intted upon as a sine qua non. Apart from these require
ments the facilities afforded in the shape of flexible connections for in 5i EP spection hand-lamps and for small portable tools render the equipment of garages and repair shops with electric-light installations a necessity. In a poorly-lighted ship repairs are invariably scrimped, and the quality of the work produced deteriorates. Especially is this so where a large proportion of the work takes place at night. Badlylighted corners foster the accunnilation of dirt and rubbish, and encourage the " skulking " type of night-shift hand. Examination cannot be carried out properly and makeshifts multiply in sheds where the lighting is inadequate. The Electric and Ordnance .Ncces sories Company, Limited, of Stellite
Works, Cheston Road, Aston, haa sent us particulars of its latest types " Victor " arc lamps. Simplicity he oaisonahng claim of this maker for its products, and 3 feature 'mist appeal to those who often have to employ our which is not of the highly-skilled order. The clockrk mechanism, and the more or less complicated arrangent of dashpots, shunt coils and other comparatively a-ile details, have all been eliminated from the " Victor " ips, in favour of a simple, magnetic-clutch arrangement. .s detail is such a simple, contrivance that we have tight it of sufficient interest to illustrate it herewith.
body consists of a solid brass casting which has a hole ed through it to take the positive carbon, and :t is ted at the lower end to accommodate the pivot of a softarmature which is made in the form of a grip. This tature envelops the top half of the clutch body. Ar the end there is a soft-iron core which surrounds half of body. The clutch is supported in the air gap formed veen the end of the series magnet core and the magnet ne. Mien the current is switched on, a magnetic pull xerted on the clutch armature, and this causes the gr)3 old the carbon firmly, at the same time the whole clutch rawn up, and it seeks to assume a balancing position in air gap, and thus strikes the arc. Examination of the ttration will reveal the absence of troublesome details. Standard Ball Bearings.
As makers of steel, brass, bronze and bell-metal balls, the proprietors of Fisher's Steel Ball and Ball Bearing Works, of Hinckley Street, Birmingham, established their works in 1883. The standard sizes and types of ball bearings, which are now being made, are of
useful design and of sound and accurate workmanship. These components are made in all the usual standard patterns, for adaptation to carry vertical as well as axle ore shaft loads, and special attention is drawn to that type in, which a cage guide ring is employed. Bearings intended for the absorption of end thrust are used with either grooved or flat steel washers, or with one flat and one grooved washer. All the bearings produced by these makers have smooth and unbroken surfaces upon which the balls roll. Fisher's " Diamond " cast steel balls are made of the best hardened crucible steel and they are
supplied in all sizes from
1-r6th of an inch to 12 inches in diameter. The makers guarantee all the balls they produce to be perfectly hardened, of high-class steel, of smooth surface and truly spherical. All balls of the same class are so gauged as to be absolutely alike within t-io,000th of an inch. A useful list is supplied by the makers in which both the English and the metric sizes of all the standard balls are tabulated from ,1-inch up to 2-inch diameters, with their corresponding average crushing loads and the safe working loads at which they may be used.
High-class Nuts and Bolts.
The Coventry Chain Company (1907), Limited, of Spon End Works, Coventry, makes a speciality of the production of well-finished bolts and nuts, setscrews, pins and studs and similar classes of work. No claim is made to the considera tion of users on the score of cheapness, as this company states that its products are the result of the finest possible workmanship put into the best material. Threads may be cut to any of the standard gauges; to international metric, to Whitworth or any other. Guaranteed limits are assured to clients' requirements, and this maker issues a notification to the effect that it is preferred to work to drawings which show the limits required, rather than to tender to samples.