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).
Suitable rectifiers for trickle charging chassis batteries.
| Identifier | ExFiles\Box 32\5\ Scan003 | |
| Date | 27th October 1922 | |
| To EFC, from R.{Sir Henry Royce} c.c. PN.{Mr Northey} X1589 R1/M27.10.22. X.664 - CHASSIS BATTERIES. X.1589. Do you know of a successful rectifier for alternating current which does not require to rotate? (for say 1 ampere). There is for instance the Noden aluminium valve, or the Cooper-Hewitt mercury vapour valve. Do you know whether either of these are commercially successful for small currents such as for instance would be used for the trickling current which we recommend so strongly for keeping the battery in condition in London? There is also the thermionic valve as used in wireless apparatus. It occurs to us that there might be an adaptation of this suitable for rectifying small alternating currents. I am strongly in favour of a garage charging current of very small amount that could be left on all night. R.{Sir Henry Royce} | ||