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).
Summary of front spring testing for a 25 HP vehicle since January 1st, 1931.
| Identifier | ExFiles\Box 106\1\ scan0238 | |
| Date | 13th April 1931 | |
| 105 TO . R.M. X5410 SUMMARY OF SPRINGS TESTED SINCE JAN. 1ST 1931. 25 H.P. FRONT [Main Table] NO. | DATE FITTED | LOADED LBS | LOADED LENGTH | TYPE LBS | MAKE | MATERIAL | LOADED CAMBER | INITIAL CAMBER AFTER TEST. | NUMBER OF LEAVES | PIECE NUMBER | DRAWING NUMBER | FIRTHS' SERIAL NUMBER | TOTAL TIME RUN HRS MIN | POSITION ON CHASSIS | POSITION OF BREAK | REMARKS 1 | 27-3-31 | 668 | 38" | 650 | FIRTHS | S M | FLAT | 3 3/8" | 9 | F55524 | F56511 | K225 | 31 30 | N.S. | 1.5 REAR CENTRE BOLT TOP LEAF ALSO 1ST LEAF FROM BOTTOM | * SEE FOOT OF PAGE FOR THICKNESS OF LEAVES AND BRINELL OF BROKEN LEAVES 2 | " | 667 | 38" | 650 | FIRTHS | S M | FLAT | 3 3/8" | 9 | F55524 | F56511 | K228 | 31 30 | O.S. | | NOT BROKEN TAKEN OFF 3 | 13.4.31 | 720 | 38" | 700 | FIRTHS | S M | .5" POS | 4.5" | 9 | F55525 | F56511 | K434 | 35 00 | O S | | NOT BROKEN { CHASSIS TAKEN OFF DRUMS 4 | 13 4 31 | 714 | 38" | 700 | FIRTHS | S M | .5" POS | 4.5" | 9 | F55525 | F56511 | K448 | 35 00 | N S | | { CHASSIS TAKEN OFF DRUMS [Footnote Table] * SERIAL NUMBER: K 225 Nº OF LEAF | FRONT END | CENTRE | REAR END | REMARKS N.S | O.S | N.S | O.S | N.S | O.S MAIN LEAF Nº 1 | 244 | 242 | 237 | 238 | 237 | 237 | BROKE 1.5" REAR OF CENTRE BOLT BRINELL 388 2 | 208 | 208 | 205 | 208 | 204 | 208 | 3 | 204 | 204 | 205 | 203 | 203 | 204 | 4 | 194 | 193 | 194 | 195 | 192 | 192 | LUBRICATION GOOD ON ALL LEAVES 5 | 182 | 181 | 180 | 180 | 182 | 181 | 6 | 173 | 173 | 172 | 172 | 174 | 173 | 7 | 172 | 172 | 172 | 171 | 172 | 172 | 8 | 161 | 160 | 160 | 160 | 161 | 161 | BROKE 1.5" FRONT OF CENTRE BOLT BRINELL 401 (9) | 157 | 159 | 161 | 161 | 156 | 157 | | ||