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 replacement of a Packard Bijur dynamo, detailing operational issues and specific fitting requirements.
| Identifier | ExFiles\Box 38\3\ Scan013 | |
| Date | 15th April 1919 | |
| X 3362 To EFC. from R.{Sir Henry Royce} c. to CJ c. to EH. R1/G15.4.19. X.3231 X.3362. RE BIJUR DYNAMO. X430 X1402 X3463 X3510 I shall be pleased to return the Packard Bijur as soon as I receive something to replace it. Owing to the wall bracket and speed pulleys etc. being specially fitted and arranged for the Bijur machine, I think it is absolutely necessary for you to send me another one of this make, i.e. the one from 49-GB. You need not, however, send the regulator, which you can experiment with on another machine. The little petrol engine here governs by cutting out with the usual "hit and miss" inertia governor. This did not work well in conjunction with the trembler on the dynamo, they would both cut out together, surge, and run right down, both in speed and magnetism, so that the charging current going to the cells was most unsteady. I therefore had to regulate the vibratory governor so that it did not cut out until much after the engine governor. You will realise that it is absolutely essential for the dynamo to replace the Packard one in all respects, because I have attached the plate by bolts through a brick wall and it would be most undesirable for me to knock further holes through this brick wall, so be sure to send the Bijur dynamo removed from 49-GB which you do not now require for any car. It must have a suitable resistance for running at the same speed as the present one, so as to give the 15 volts necessary to charge the 12 volt battery. | ||