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).
Specifying the requirements for mechanical testing of parts, including heat treatment and hardness checks.
| Identifier | ExFiles\Box 146\1\ scan0120 | |
| Date | 17th July 1937 guessed | |
| D.T.D.87.-3. 8. MECHANICAL TESTS. - (i) In addition to the mechanical test samples called for in the latest issue of B.S. Specification Sll, further test samples shall be provided and shall be heat treated (hardened and tempered, annealed and nitrogen hardened) simultaneously with each batch of parts made from the same cast. These test samples shall be protected against absorption of nitrogen by an approved process and their Izod value and Brinell hardness shall comply with the requirements specified in clause 2 above. (ii) The hardness number of the hardened case of each finished nitrogen hardened part shall be to the satisfaction of the inspector. The hardness number shall be recorded for information purposes. H.M. CAVE-BROWNE-CAVE, Air Commodore, Director of Technical Development. | ||