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).
Instructions for modifying radiator hex-ended matrix tubes for 40/50 HP and 20/25 HP models.
| Identifier | ExFiles\Box 16\2\ Scan034 | |
| Date | 9th September 1931 | |
| X7250 E.{Mr Elliott - Chief Engineer} Dept. c. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} By/SS{S. Smith}1/J9.9.31. X.7250 X.5250 40/50 HP. and 20/25 HP. RADIATOR HEX. ENDED MATRIX TUBES. The following procedure should be dealt with as soon as possible. (1) 40/50 HP. E.82196 (6 3/4 to 8 mm.) should be marked "small" tube and the depth of indentations increased from .025" to .030". A print should be sent to the makers so that tools may be altered for future supplies. (2) 40/50 HP. E.82520 (7 1/4 to 9 mm.) marked "large" tube should be issued for three experimental sets at once. The depth of indentations of this tube should be .040" (3) 20/25 HP. E.57006 (6 3/4 to 8 mm.) should be redrawn to 3.250" long with indentations .030" deep. It is intended not to order these at present. (4) 20/25 HP. A new drawing should be issued for the "large" tube (7 1/4 to 9 mm.) 3.250" long with indentations .040" deep and three experimental sets instructed. All these tubes will be in copper. By/SS.{S. Smith} | ||