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).
Chart comparing total static stress variation on valve springs from various manufacturers against the average stress range for carbon steel wire.
| Identifier | ExFiles\Box 126\4\ scan0151 | |
| Date | 6th June 1936 guessed | |
| AVERAGE STRESS RANGE FOR GOOD CARBON STEEL WIRE, B. 23., ELASTIC LIMIT, STRESS IN THOUSAND POUNDS PER SQUARE INCH., TOTAL STATIC STRESS VARIATION ON VALVE SPRINGS., STRESS IN THOUSAND POUNDS PER SQUARE INCH., BUICK 181786., BUICK 1245449 & 1239847., BUICK 1245836, HUPP 78050, HUPP 73480, HUPP 73481, G.M.T. 065486 & BUICK 181817., CADILLAC 883326, NASH 41535 - 84410., G.M.T. 065467, G.M.T. 065468, CHEVROLET 835477 & 83639., NASH 41534 - 84409, VIKING, G.M.T. 065485, NASH., NASH 41535 & 84410., G.M.T. 065486, CHEVROLET 835773, NASH x 86461, NASH 19140, ESSEX - HUDSON 52036, FRANKLIN 52036, OAKLAND 441280, REO 3 A A 57, REO 3 N A 27, FRANKLIN 52039, REO 3 NA{Mr Nadin} 37, REO 3 N A 3, ESSEX - HUDSON, NASH 52036, FRANKLIN 52039 | ||