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).
Request to manufacture one dozen Dynamo Temperature Indicating Sentinels with a specific melting point.
| Identifier | ExFiles\Box 60\1\ Scan242 | |
| Date | 2nd June 1930 | |
| X7660 To H.L. from E.F.C. EFC1/ADL 2.6.30. X.7660. DYNAMO TEMPERATURE INDICATING SENTINELS. A considerable time ago you kindly made up for us some of the above type sentinels consisting of small globules of low melting point metal attached to short lengths of copper wire. We should be pleased if you would have made up for us one dozen such sentinels having a melting point of 80°C. For this purpose we send herewith, a pattern and a supply of copper wires. EFC/CAP. Received | ||