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).
Report from the I.A.E. Research and Standardisation Committee on a new tachometer.
| Identifier | ExFiles\Box 165\3\ img094 | |
| Date | 1st May 1934 | |
| COPY. 86033 I.A.E. RESEARCH AND STANDARDISATION COMMITTEE Research Department, 5, Bolton Road, Chiswick, W.4. No. 7140. Class 481, 21 May, 1934. A New Tachometer J.{Mr Johnson W.M.} of Scientific Instruments, April, 1934, p.124. A new tachometer, manufactured by Salford Electrical Instruments Ltd., comprises an A.C. generator with a revolving permanent magnet and fixed coils. The distance between the coils and the magnet can be varied so as to adjust the voltage generated at a given speed. A full wave rectifier is incorporated in the generator and the indicating instrument is of the moving coil D.C. type giving a linear scale which can be calibrated in r.p.m., m.p.h., etc., as required. The generator is 4-5/8 in. long, weighs 20 oz. and has an output of 8 volts and 10 milliamps at 2000 r.p.m. The price ranges from £5.10.- J.S.B. | ||