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 The Morgan Crucible Company discussing their laboratory test results on nickel-copper alloy rings compared to pure copper rings.
| Identifier | ExFiles\Box 166\1\ img093 | |
| Date | 5th March 1937 | |
| TT 4109 6093 CODES, A.B.C. 4th, 5th & 6th (5 LETTER) EDITIONS, A.I. LIEBERS & WESTERN UNION (UNIV. & 5 LETTER EDIT.) & BENTLEYS. Inland Telegraphic Address, "CRUCIBLE, PHONE, LONDON" (2 words only chargeable) Cable Address, "CRUCIBLE, LONDON" Telephone No BATTERSEA 2250. THE MORGAN CRUCIBLE COMPANY LIMITED BATTERSEA WORKS, CHURCH ROAD, LONDON. S.W.11. MORGANITE REGISTERED TRADE MARK REGISTERED TRADE MARK IN REPLY PLEASE REFER TO Z DEPT Zyc/EC 5th March, 1937. Messrs. Rolls-Royce Limited, D E R B Y. WST Dear Sirs, In reply to your letter reference Rm{William Robotham - Chief Engineer}/Wst.5/AP of the 24th ultimo, we presume your enquiry has been prompted by the technical article which appeared in the February number of "The Nickel Bulletin". Our personal experience with nickel-copper alloys has been limited to sliprings, and we are not aware that the possibility of employing this material for commutators has been explored. A year or so ago we carried out in our Laboratory tests with a series of rings of different materials including 5% nickel-copper to determine their relative merits. With copper graphite and natural graphite brushes we found little difference in performance between copper and nickel-copper rings, although the rate of wear of the nickel-copper was certainly lower than that of pure copper. With an electrographitic quality, however, there was a very marked difference in that the rate of wear of brushes on the copper rings was approximately one-tenth only of the rate of wear of the same grade of brush on the nickel-copper rings. | ||