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).
Test results diagram and material composition for Levitt Metal.
| Identifier | ExFiles\Box 37\4\ scan 092 | |
| Date | 12th June 1917 | |
| UPTON LEWIS MACHINE TEST No 5 MARK L DATE 12-6-17 MATERIAL LEVITT METAL STATE SECTION 1/4 x 1/4 DIST. BETWEEN JAWS 4" THROW OF CRANK 3/4" SPEED R.P.M. 906 SPRINGS 4 1/2 32 PER INCH TOTAL NO OF REVS OF DIAGRAM LEVITT METAL CONTAINING 96.4% OF ALUMINUM, 2.8% OF COPPER, .5% OF ZINC & .3% MANGANESE | ||