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 Cutler-Hammer Mfg. Co. detailing commercial molding limits and standard breaking tests.
| Identifier | ExFiles\Box 24\2\ Scan136 | |
| Date | 22th April 1921 guessed | |
| -2- hence the commercial limits to which a piece can be moleed are from 5/1000 to 10/1000 from blueprint dimensions, and like pyroplax, the more allowance possiblethe lower the cost of molding. Referring to standard breaking tests, as perhaps you know, this test is made of the cross breaking strength when tested in the form of a standard briquette supported on knife edges 2" apart with the load applied with the knife edge placed between these supports. If there is any further information you require, we shall be very glad to assist you in any way possible. Yours truly, CUTLER-HAMMER MFG. CO. (Sgd.) M.F.Coyne. Sales Department. | ||