The Purchase Department.
Page 18
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You Can Get It At " Depot " (London).—The Enots pressure pump is sold by Messrs. Benton and Stone, Braeebridge Street, Birmingham.
" S.T." (Carlisle).—The 1 in. thick fibre boards for which you inquire can be obtained from Brown Bros., Ltd., Great Eastern Street, London, E.C. "VT." (Wolverhampton).—The rubber insulating canvas-lined tubes to which you refer can be obtained from Brown Bros., Ltd., Great Eastern Street, London E.C.
§ park Arresters" (London).—If you cannot buy from the maker of the steam wagon, we believe you can obtain spark arresters from Messrs. IL Welford and Sons, Commercial Road, London, E., to order. " C,F.H." (Bradford).—Engines of the type for which you inquire are made by the following manufacturers: White and Poppe, Ltd., Coventry ; Tylor and Sous, Ltd., Belle Isle Works, York Road, London, N. ; W. H. Dorman and Co., Ltd., Stafford ; Commercial and Marine Engine Co., Ltd., Oak Works, Church Road, Hanwell, W.
Amongst Herbert's Latest Improvements.
In view of the extraordinary and unprecedented increase in the demand for motor vehicles of certain types, and the corresponding activity in the various factories concerned, many of them have found it necessary to lay down increased plant in order to cope with the growing output. The occasion is opportune, therefore, to draw attention generally to the productions of Alfred Herbert, Ltd., Coventry, whose eminenee in the machine-tool branch of engineering needs no confirmation here.
One of their latest improvements in connection with Herbert drilling machines is a self-engaging automatic feed. This comes into operation the moment the drill meets the work, and operates independently of the workman until it is tripped, either by hand or by a atop. The drill then instantly returns ready for commencing another hole, the advantage of this arrangement being that the operator is free for other work, and can easily keep four spindles going at once.
Another interesting machine is the Bullard vertical turret lathe for machining road wheels for commercial vehicles.
To those who are engaged in the unusual business of machining shells, and there are, of course, several of such works in the motor trade, this maker's No. 9 combination turret lathe is especially recommended.
The "Perfloc" Lack-nut.
Another lock-nut which has recently been brought to our notice is that known as the " Perfloe," and in*roduced by the Ergineerieg Improvement Co., Ltd., 39, St. James's Street, London, S.W.
This accessory combines, in one unit the functions of a nut and locking device, thereby doing away with the usual secondary mit and split-pin. The special feature of the " Perfloe " nut is the Simple yet ingenious method by which the self-locking action is secured. The nut is itself of standard form and thread, but of a size larger than the bolt, in order to allow a spiral spring to 'be embedded in the thread of the nut.
One end of this spring is anchored in the nut, B14 whilst the other end projects slightly beyond one of the faces, a slot being cut to take this end without jamming on the face of the washer. The accessory is direct in action, locking itself instantaneously and automatically into position. It is made in all the standard sizes., and is adaptable to a wide range of bolts, above and below the average dimensions.
The " Perfloc " nut has been subject to exhaustive tests with regard to vibration, and the security it offers, and the results have proved most favourable.
The "Rapid" Valve Truer.
There are several devices on the market for grinding in the valves of internal-combustion engines, and the " Rapid " is certainly one which is. giving very satisfactory results. It has been produced to, meet the demand of garage proprietors and engineers generally as a means of truing valves, which will not remove more metal than is abselutely necessary to obtain a good surface, and which will not damage the valve face or spindle during re-facing operations.
The " Rapid " device is marketed by Brown Bros., Ltd., Ceeeat Eastern Street, E.G. As will be seen from the illustration which we include, the device is self-contained and can be readily and effectively used to true a valve in a short space of time whilst the finish obtained is quite equal to that given in a lathe with skilled workmanship. One cutter will true a large number of valves, and when it is worn it may readily be recut or renewed at a very low cost. The construction of the device and its working should be self-evident to our readers upon reference to the accompanying illustrations. The valve-truer has a cylindrical outside easing, to which is screwed a bevel cutter with serrated teeth. Inside the casing are two coned parts which go to form ban-races for two sets of balls. The function of this part of the tool is to hold the valve stern concentrically, whatever be the diameter of the stem, to enable the valve to bed evenly on the cutting surface. The device will take most sizes of valves on the market, and adjustment is provided for taking stems of different diameters: knurled edges, do away with the need for the use of a spanner.