From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Letter from J. Lacoste & Co. explaining the function of the holes in the piston of Triou Shock Absorbers.
| Identifier | ExFiles\Box 79\2\ scan0062 | |
| Date | 30th August 1913 | |
| TELEGRAPHIC ADDRESS: YABURAL-WESTCENT-LONDON. TELEPHONE: 137 REGENT. X235 x Y09 J.{Mr Johnson W.M.} LACOSTE & CO., 184, SHAFTESBURY AVENUE, LONDON, W.C. HEAD OFFICE: 28, BOULEVARD DE STRASBOURG, PARIS. WORKS: COURBEVOIE-SEINE-FRANCE. BRANCH OFFICE: 95, BOULEVARD DU HAINAUT, BRUSSELS. TRADE MARK 30th Aug. 1913. Handwritten: Mr Stions seen 1.9.13. + he has retain sh leaflets etc Messrs. Rolls-Royce, Ltd., Nightingale Road, DERBY. Dear Sirs, Your Ref. Wor{Arthur Wormald - General Works Manager}/SM3/L26813. We duly received your favour of the 26th inst., which, however, only came to hand to-day, through being addressed to 134 Shaftesbury Avenue, instead of 184. With reference to the Triou Shock Absorbers, we may say that the two holes in the piston are perfectly correct. They are expressly put there for the purpose of relieving the braking effort offered to the compression of the springs. These holes having flat steel plates on one side only work one way; hence it is absolutely indispensable that the Shock Absorbers be fitted in such a manner that the rebound of the road springs screws the piston inward, and at the compression of the road springs, that is when the road springs and chassis come together, the piston of the Shock Absorber should be screwed outwards. It is absolutely a mistake to endeavour to give as much braking effort to the upward movement of the spring as to the | ||