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 detailing the characteristics of a Weston instrument, including its scale, voltage, current, and resistance.
| Identifier | ExFiles\Box 34\2\ Scan051 | |
| Date | 6th November 1918 | |
| RR 238 (300 Bks.) (SF 152. 6-11-18.) MP 197880 ROLLS-ROYCE LIMITED. INSTRUCTIONS. To 19 Order No Customer's No. 3 It is mounted on a stand, which with bolts and nuts adds 11.5 lbs to this. The Weston instrument used in conjunction with this machine has a scale reading up to 2000 in r.p.m, & has the following characteristics. Volts. The factor to bring the readings to volts on the instrument only, is .000246. i.e, the scale reads roughly 4000 times the voltage, so that full scale deflection represents nearly .5 volt. Amps. The ampères flowing in the instrument, are .00000705 times the readings. i.e milli-ampères are 7.05 times the thousands of r.p.m indicated. Resistance. The resistance is thus 34.9 Ω, which together with the Signed This Sheet must be filed on completion of the work. | ||