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).
Specifications for two types of thermostat springs, A and B.
| Identifier | ExFiles\Box 39\4\ Scan266 | |
| Date | 14th April 1932 | |
| Hs{Lord Ernest Hives - Chair} 580 THERMOSTAT SPRINGS A B DIA OF WIRE .064" (16 S W G) .072" (15 S W G) INSIDE DIA .780" .780" SOLID LENGTH 1.035" 1.050" FREE LENGTH 4.360" 3.860" LOAD AT 1.062" 10 Lbs 15 1/2 lbs No OF COILS BEFORE GRINDING SQUARE 16.5 14 H4 A 32 14.4.32 J.A.H. | ||