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 experimental investigation and comparison of Lucas and Smith dynamos.
| Identifier | ExFiles\Box 3\5\ 05-page163 | |
| Date | 4th March 1920 | |
| S.R. No. 00 T.P. No. 49 L.S. No. 000 To R.{Sir Henry Royce} contd. -4- CK{Mr Clark}2/T4.3.20. Lucas (cold) 11.5 miles per hour. Lucas (hot) 13.9 " " " Smith type A.{Mr Adams} (cold) 9.6 " " " Smith " A.{Mr Adams} (hot) 11.2 " " " } Assuming the " " 2D.(cold) 8.25 " " " } same size dy{F R Danby}- " " 2D.(hot) 9.6 " " " } namo pulley as } present stand- } ard for Lucas. With reference to the Smith dynamos, we have now completed the experimental investigation of the operation of the first dynamo received, and have the E curves referred to some time ago ready for issue. We have further received another Smith dynamo called by them their type 2D. This you will see from figures already given has a still earlier cutting in speed. At the moment we have not got the exact out-put curve of this dynamo but this will be obtained almost immediately. We have, however, taken a heating test which is one of those already referred to. This new machine, although showing a much more satisfactory finish and having undoubtedly a better and quieter commutator and brush system than the first, nevertheless suffers from one or two defects which we have pointed out to the makers. These were mostly minor and remediable defects and have now been so remedied which caused delay in the tests of this machine. The principal defect is that this dynamo is very bad for singing, which the first one was not, and this in spite of the fact that a good Contd. | ||