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).
Nomogram calculation sheet providing a conversion table for bore or stroke measurements from inches to millimeters.
| Identifier | ExFiles\Box 77\5\ scan0133 | |
| Date | 13th September 1918 | |
| R.R. 235A (500 T) (S.D. 408. 26-4-17.) Bm. 2/156/13. X 3290 1. 13.9.18. NOMOGRAM CALCULATIONS Bore or stroke scale. Inches mm. from datum. Inches. mm. from datum. 2.0 .51 5.0 199.48 2.1 11.10 5.1 203.78 2.2 21.21 5.2 208.00 2.3 30.86 5.3 212.14 2.4 40.10 5.4 216.19 2.5 48.97 5.5 220.18 2.6 57.48 5.6 224.9 2.7 65.68 5.7 227.93 2.8 73.58 5.8 231.71 2.9 81.20 5.9 235.42 3.0 88.56 6.0 239.07 3.1 95.68 6.1 242.66 3.2 102.52 6.2 246.19 3.3 109.25 6.3 249.67 3.4 115.74 6.4 253.09 3.5 122.03 6.5 256.45 3.6 128.15 6.6 259.77 3.7 134.10 6.7 263.04 3.8 139.89 6.8 266.25 3.9 145.53 6.9 269.42 4.0 151.03 7.0 272.55 4.1 156.39 7.1 275.63 4.2 161.62 7.2 278.66 4.3 166.73 7.3 281.66 4.4 171.72 7.4 284.61 4.5 176.60 7.5 287.53 4.6 181.38 7.6 290.40 4.7 186.50 7.7 293.24 4.8 190.62 7.8 296.04 4.9 195.10 7.9 298.81 Contd. | ||