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).
Comparison of Smith dynamos with Smith cut-outs versus Lucas dynamos with Lucas cut-outs.
| Identifier | WestWitteringFiles\D\March1920\ Scan45 | |
| Date | 16th March 1920 | |
| To R.{Sir Henry Royce} from Ck.{Mr Clark} c. to CJ. c. to E.{Mr Elliott - Chief Engineer} c. to Bn.{W.O. Bentley / Mr Barrington} x.295 c. to PN.{Mr Northey} x.3014 c. to Da.{Bernard Day - Chassis Design} x.3770/11 c. to By.{R.W. Bailey - Chief Engineer} c. to EP.{G. Eric Platford - Chief Quality Engineer} c. to Hs.{Lord Ernest Hives - Chair} ORIGINAL. Ck{Mr Clark}2/T16.3.20. COMPARISON OF SMITH DYNAMOS OPERATING WITH SMITH CUT-OUTS WITH LUCAS DYNAMOS OPERATING WITH LUCAS CUT-OUTS. Further to our :- Ck{Mr Clark}2/T4.3.20 - Lucas and Smith Dynamos. Ck{Mr Clark}4/T5.3.20 - " " " Cut-outs. Ck{Mr Clark}1/T13.3.20 - Smith dynamo and cut-out. we have now made a series of careful experiments on the bench on the combined operation of Lucas and Smith dynamos with their respective cut-outs. For each combination of dynamo and cut-out, the following scheme was adopted - (a) for the combination in a quite cold condition and with a battery E.M.F. of 12.4 and (b) for the combination in the hottest condition attained after running for some hours, and with a battery E.M.F. of 13.6 Having made the necessary connectionse of dynamo, cut-out, battery and instruments - (1) The dynamo speed was gradually increased until the cut-out was just operated and at the instant of operation the dynamo volts and speed were noted and recorded. (2) After the operation of the cut-out the speed was readjusted to the same figure as for (1) and with the cut-out still in the "on" position, the voltage and the amperes to or from the battery were noted. Contd. | ||