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).
Micro-examination report comparing the surface finish and decarburisation of piano wire from three English manufacturers.
| Identifier | ExFiles\Box 17\6\ Scan272 | |
| Date | 5th July 1934 | |
| X7060? L.H. Smith Micro-Examination Report. M960. To-Mr. HLL/AG.5.7.34. Laboratory. -H.{Arthur M. Hanbury - Head Complaints} -E.{Mr Elliott - Chief Engineer} Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} G.{Mr Griffiths - Chief Accountant / Mr Gnapp} Wor.{Arthur Wormald - General Works Manager} Re: Piano Wire of English Manufacture. As suggested in our report M943/A, you have obtained samples of the above wire, to D.T.D. Specification 5A. These samples are :- (a) Brunton's "Jupiter" wire. 10 S.W.G. (b) Wire from Salter's. Make not stated. Size 0.135" dia. (c) Shipman's wire. 10 SWG. Surface Finish. The accompanying photo. No. Al,100, X10. shows typical examples of the surface of the three wires. The Brunton's "Jupiter", and the Salters samples are similar in that the markings are longitudinal. The surface irregularities shown in this photo. are not deeper than 0.0005". The Shipman's wire is smoother than either of the others and the surface marks are transverse and similar to those in Stubs chrome vanadium wire. In none of the three samples is there any sign of cuts and pits, such as we have frequently found in chromium vanadium wire drawn by Messrs. Stubs. Surface Decarburisation. Specification D.T.D. 5A calls for freedom from surface decarburisation. Photomicrograph No. Al,D01, X150, shows that in both the Bruntons and Shipmans samples there is decarburisation, the ferrite streamers penetrating about 0.0015". In the sample from Salter's the decarburisation was negligible. contd. | ||