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).
Conversion table for millimeters to inches.
| Identifier | ExFiles\Box 77\5\ scan0137 | |
| Date | 26th April 1917 guessed | |
| (C) mm. Inches. mm. Inches. 50 1.968 144 5.669 52 2.047 146 5.748 54 2.126 148 5.826 56 2.204 150 5.905 58 2.283 152 5.98 60 2.362 154 6.06 62 2.441 156 6.14 64 2.519 158 6.22 66 2.598 160 6.30 68 2.677 162 6.38 70 2.756 164 6.46 72 2.834 166 6.54 74 2.913 168 6.61 76 2.992 170 6.69 78 3.070 172 6.77 80 3.149 174 6.85 82 3.228 176 6.93 84 3.307 178 7.01 86 3.385 180 7.09 88 3.464 182 7.17 90 3.543 184 7.24 92 3.622 186 7.32 94 3.700 188 7.40 96 3.779 190 7.48 98 3.858 192 7.56 100 3.937 194 7.64 102 4.015 196 7.72 104 4.094 198 7.80 106 4.173 200 7.87 108 4.252 202.5 7.97 110 4.330 205 8.07 112 4.409 207.5 8.17 114 4.488 210 8.27 116 4.567 212.5 8.37 118 4.645 215 8.46 120 4.724 217.5 8.56 122 4.803 220 8.66 124 4.882 222.5 8.76 126 4.960 225 8.86 128 5.039 227.5 8.96 130 5.118 230 9.06 132 5.196 232.5 9.15 134 5.275 235 9.25 136 5.354 237.5 9.35 138 5.433 240 9.45 140 5.511 242.5 9.55 142 5.590 245 9.65 247.5 9.74 250 9.84 | ||