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).
Price list for various thermostat models, detailing specific orders from January to May 1938.
| Identifier | ExFiles\Box 156\2\ scan0094 | |
| Date | 16th May 1938 | |
| Rm{William Robotham - Chief Engineer}/Std.6/MH.{M. Huckerby}16.5.38. LIST OF THERMOSTATS & PRICES ETC. Order No. Date Ordered. No. Ordered. Type of Thermostat. Price Charged. 55225 12.1.38 1 X.30065 with 1 1/4" valve and 78-80°C open. £1/13/6d. each. " " 1 X.30065 (BV) (Standard) 15/6d. each. 55991 29.1.38 1 X.30065 with 1 1/4" valve. 78-80°C open. £1/13/6d. each. " " 1 X.30065 converted 1 3/4" valve 78-80°C open. 18/0d. each. 59499 31.3.38 1 X.30065/5 - 1 1/4" valve and 68-70°C open - 62105 13.5.38 2 X.30065/7 (BV) £2/5/0d. each. | ||