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).
Cubic capacity scale showing formulas and a conversion table from cubic inches to a value 'Z from datum'.
| Identifier | ExFiles\Box 77\5\ scan0135 | |
| Date | 26th April 1917 guessed | |
| CUBIC CAPACITY SCALE. z = 1/3 ( 1 + log V - .89509) = 1/3 log V + .03497 z = 500/3 log V + 17.485 mm z from datum = 500/3 log V - 132.5 Cubic Inches. Z from datum. Cubic Inches. Z from datum. 6 - 2.8 41 136.3 7 8.3 42 138.0 8 18.0 43 139.7 9 26.5 44 141.4 10 34.2 45 143.0 11 41.1 46 144.6 12 47.4 47 146.2 13 53.1 48 147.7 14 58.5 49 149.2 15 63.5 50 150.7 16 68.2 52.5 154.2 17 72.6 55 157.6 18 76.7 57.5 160.8 19 80.6 60 163.9 20 84.3 62.5 166.8 21 87.9 65 169.7 22 91.2 67.5 172.4 23 94.5 70 175.0 24 97.5 72.5 177.5 25 100.5 75 180.0 26 103.3 77.5 182.4 27 106.1 80 184.7 28 108.7 82.5 186.9 29 111.2 85 189.1 30 113.7 87.5 191.2 31 116.1 90 193.2 32 118.4 92.5 195.2 33 120.6 95 197.1 34 122.7 97.5 199.0 35 124.9 100 200.8 36 126.9 105 204.4 37 128.9 110 207.7 38 130.8 115 210.9 39 132.7 120 214.0 40 134.5 125 217.0 (Contd). | ||