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).
The performance of the Elliott ammeter compared to the Weston instrument.
| Identifier | ExFiles\Box 168\5\ img053 | |
| Date | 1st February 1926 | |
| Y4622 Exptl. Report. Exp.No.4622 EFC2/T1.2.26. To R.{Sir Henry Royce} from EFC. c. E.{Mr Elliott - Chief Engineer} Da.{Bernard Day - Chassis Design} HJ. c. CJ. EY. KP. c. Wor.{Arthur Wormald - General Works Manager} Rg.{Mr Rowledge} RE ELLIOTT AMMETER Four Elliott ammeters, similar in appearance to the Weston instrument, but made up by the British firm Messrs. Elliott Bros., were some time ago received for experimental test. These instruments on preliminary bench tests showed themselves to be practically equally satisfactory with the Weston in general respects, such as accuracy of readings, dead-beatness, over-load, etc. etc. The finish of the instrument, however, is not quite equal to that of the Weston, but it is understood that this need not be taken into account in the tests, because the dials of the instruments, if standardised, would in any case be produced by the same firm who make the dials for our other instruments, and would therefore be of the same finish. Up to the present, one instrument has satisfactorily completed a 10,000 mile test on a 40/50 car, and the result of this test is contained in JC.3 attached. As a 10,000 mile test on a 20 HP., to which a second Elliott ammeter is fitted, is shortly to be undertaken, it is considered that the standardisation of the Elliott ammeter might be deferred until this also has passed the 10,000 mile test satisfactorily, it being remembered that standardisation will apply to both chassis. Contd. | ||