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).
Temperature compensation for battery charging, considering the use of a bi-metal strip and a series coil.
| Identifier | WestWitteringFiles\R\2December1927-February1928\ Scan170 | |
| Date | 15th February 1928 guessed | |
| -3- Contd. Both these effects work the same way in varying the point of operation of the auto switch for the same condition of charge of the battery when everything is hot as compared with when everything is cold, and in fact to such an extent that it almost appears desirable to introduce some kind of temperature compensation if this can be done comparatively simply. The most hopeful idea that has been suggested is the use of a bi-metal strip support for the fixed point. An entirely electrical method of temperature compensation has been sought for but so far without success. The matter is still under consideration. (3) Series Coil. The advantages to be derived from a series coil not carrying, as previously was the case, the head lamp current, but carrying the main current either additively or in opposition have been considered. There would appear to be a very slight advantage in the use of a series coil carrying the main current, but so small as to put it quite out of court in view of the additional complication. That is to say, it is quite decided, taken allround, that there is no advantage to be gained by the use of a series coil carrying the main current. Contd. | ||