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).
Electrostatic test report comparing a Weston Model 301 and an Alliott Type 'M.R.' instrument.
| Identifier | ExFiles\Box 168\5\ img112 | |
| Date | 16th May 1927 | |
| COPY ROLLS ROYCE MINIATURE INSTRUMENTS Weston Model 301. No. 456151 Alliott Type "M.R." No.146020 ELECTROSTATIC TESTS: Mounted side by side flush in cardboard box, 6½" x 6½" x 6". 16-5-27 Weather cloudy: Temperature 70°F.{Mr Friese} indoors After vigorous rubbing of glasses with Selvyt, no deflection on either instrument; by hand also no deflection. Warmed up to 120° F.{Mr Friese} over an electric lamp for 1½ hours; both instruments thoroughly warmed through: rub with Selvyt, no deflection on either; rub by hand:- Weston deflects 2 divisions, Elliott no deflection. Deflection not sustained more than 3 or 4 seconds. On cooling down (1½ hours after removal of lamp) and while instruments are presumably still dry; rubbing by hand produces on the Weston about ½ division, and on Elliott ¼ division deflection, but vigorous and sustained rubbing is necessary to cause movement of pointers. 17-5-27 After 2 hours exposure to sunlight, not very bright. Instruments slightly warm (90° F.{Mr Friese}) and rubbing by hand:- Weston gives 2 divisions deflection. Elliott " no deflection. 19-5-27 Conditions normal: Temperature 70° F.{Mr Friese}, weather dry Rubbing by hand produces:- Weston 1 division deflection Elliott ¼ " P.T.O ENCLOSURE No 872 | ||