Repairing Scored Cylinders.
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Inquiries at any of the big welding concerns who specialize in the repair of cylinders will reveal threfact that by far the greater proportion of cylinders sent for repair are suffering from scores. Thie ie due to the displacement of the gudgeon pin, the subsequent reciprocating motion of the piston then resulting in a groove or score being out in the cylinder wall. The replacement of the scored cylinder is an expensive job and the most economical method of curing the trouble hitherto has been by welding. To weld a scored cylinder, the cylinder must be preheated and the new metal lewd into the groove ; after which the cylinder must be re-ground to a slightly lereer bore, and a new piston fitted In the case of a multiple-cylinder casting, re-grinding and new pistons will be necessary in all the cylinders. Although
satisiactory renair can be secured by these means, it will be seen that the cost of filling a email groove with metal is comparatively high.
In the Lawrence process, the operation ma be effected at a considerably lower cost, while it is claimed' that even more satisfactory results are obtained then by welding.
The. process consists briefly in running a special metal into the groove or er2ore and subsequently smoothing it off to the .original internal contour of the cylinder. The cylinder ie not heated in any way and there is thus no danger of distortion.. The wear of the piston ring is taken by the undamaged portion of the cylinder wall, whilst the softer metal, filling the score, prevents leakage of gas.
If the cylinder has worn oval, the Lawrence process can also be employed to reduce the amount of re-grinding which is necessary. The deeper pasts of the oval are filled with Lawrence metal and the cylinder is then ground circular;
From the manufacturer's point of view, an distinct from that of the road user, the Lawrence pox .e-se is also of interest.'Al is well known, a large proportion of modern castings have to be scrapped owing to defects such as blowholes, etc. When these defects occur in the cylinder bare itself, the Lawrence process can be applied. to produce a sound casting. The special. metal employed is claimed to flow into the pores of the casting, thus closing the blow hole, etc. Full deteils can be obtained from the New Welding Co., 26, Pe:eel:eery Avenue, London, E.C. 1, who have acqnired the rights for Great Britain and Ireland.
Thornyeroft Dividends.
The accounts of John Thornycroft
and Co., Ltd., for the year ended. July 31st, 1919, have been completed, and subject to audit, the directors propose to recommend that a 3 per cent. dividend on the preference shares be paid, making 6 per cent, for the year, and that a 7i per cent. dividend on the ordinary shaxes making 14 per cent, he paid.
Inst.A.E. Appointments Bureau.
Members cf the S.M.N. and T. who have vacancies to be filled on the works side—werks managers, designers, d_raughtemen, etc., will, we hope, take advantage of this new department which has recently been started by the Institution of Automobile Engineers. It would appear that members of the Institubion make goad use of the bureau, but that members of the Society do not Communications should be addressed to Mr. Basil Joy. the secretary of the I.A.E,„ 28, Victoria Street, S.W. 1, who proposes to give personal attention to the work c f the bureau.
Local Proceedings.
It has been resolved by Swansea T.C. to obtain Parliamentary powers to supply certain routes with omnibuses.
• The tender of Aveiing and Porter, Rochester, for four tractors at £1,049 each has been accepted by Tipperary C.C.
Lambeth B.C. has accepted the tender of Leyland Motors (1914), Ltd., for supplying a vacuum gully wagon at a cast of £1,081.
The Tramways Committee of the Walthamstow U.D.C. estommends the promotion of a Bill to secure powers to run motor ominbuse.s.
Bolton Corporation Streets Committee has asked a sub-committee to deal with the question of the purchase of a motor vehicle for the department An inquiry has been held into an application by the Newport T.C. to borrow money for the purchase of electric vehicle and motor lorries for scavenging.
Hull Corporation Works Committee adopted a report of the city engineer in favour of purchasing two 6-ton steam wagons and trailers, five 3e-ton motors of a type to be subsequently determined, and two motor sweeping machines.
Having considered the question of the purchase of a 5-ton steam tipping lorry, the Water Committee of the relaegow, Corporation has now empowered its chairman and engineer to order such a vehicle, and also to purchase, for immediate use, a 34on petrol vehicle.