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).
Quotation for a 3 B.HP motor and regulator gear from The Crypto Electrical Co. Ltd.
| Identifier | ExFiles\Box 61\2\ scan0039 | |
| Date | 25th July 1928 | |
| X2065 25th July 1928 QUOTATION FOR 3 B.H.P. MOTOR AND REGULATOR GEAR FOR EXPL. DEPT., OBTAINABLE FROM THE CRYPTO ELECTRICAL CO. LTD. A frame size 253, protected type, shunt wound interpolar motor, with two end shield ball bearings and standard bare shaft extension, wound for 100/110 volts D.C. capable of developing continuously 3 h.p. at a speed of 1500 r.p.m. The machine would be suitable for speed increase by shunt control up to 3,000 r.p.m. and by series control against constant torque down to 940 r.p.m. PRICE .................... £16. 0. 0d. net A semi-enclosed F.C.B. pattern shunt regulator to increase the speed of the motor offered from 1500 to 3000 r.p.m. PRICE .................. £3. 5. 0d net Also a F.O.B. Pattern, semi-enclosed, series regulator to reduce the speed from 1500 to 940 r.p.m. against constant torque. PRICE .................... £3. 10. 0d. net Total cost..£22. 15. 0d. net. | ||