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).
Graph from 'Spectre' frame tests plotting angular deflection against torque for spot-welded seams.
| Identifier | ExFiles\Box 94\4\ scan0013 | |
| Date | 1st August 1934 | |
| "SPECTRECodename for Phantom III" FRAME TESTS EX 13183. SPOT WELDED SEAMS - AVERAGE PITCH OF WELDS 1.500" LENGTH UNDER TEST 5FT 6INS. TOTAL LENGTH 6FT 1-8-34 ANGULAR DEFLECTION - DEGREES .600 .500 .400 .300 .200 .100 12 S.W.G. AVERAGE THICKNESS .108" BRINELL 137 TORQUE LB FT. 200 400 600 800 1000 WB{Mr Brazier/Mr Bell} | ||