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).
Certificate of Assay for two samples of Tungsten Contact Points.
| Identifier | ExFiles\Box 35\6\ scan 196 | |
| Date | 31th August 1926 | |
| Registered Reference No. RB{R. Bowen} 32/409 JOHNSON, MATTHEY & Co LIMITED, Assayers & Melters. TO THE BANK OF ENGLAND. HIS MAJESTY'S MINT, &c. Telephone, Holborn 6830/8 Telegrams, "Matthey, Smith, London" CODES USED, BENTLEYS, A.B.C. (4TH & 5TH ED.{J. L. Edwards}) A1. BEDFORD MCNEIL, LIEBERS, MARCONI, & WESTERN UNION. Assay Offices & Ore Floors. HATTON GARDEN, London. E.C.1. 31st August 1926. Certificate of Assay. For Messrs. Rolls-Royce Ltd., Derby. We have examined assayed the 2 Samples of Metal submitted to us and find the following to be the result. Tungsten Contact Points 20/8/1926 WD.{Mr Wood/Mr Whitehead}14/NJ20826 No.1 R:R.Lever. Size Contact on Threaded Bolt used for test. .175" x .035", weight 3.90 grains. This is composed of Tungsten. Impurity or other ingredient ... traces of Iron only. Apparently welded direct on to bolt. No.2 Remy Lever. Size Contact on Threaded Bolt used for test. .175" x .043", weight 4.565 grains. This is composed of Tungsten. Impurity or other ingredient ... traces of Iron only. A layer of Copper existed between the contact and bolt head as a welding medium. JOHNSON, MATTHEY & CO LIMITED Director | ||