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).
Letter to a customer regarding car repairs and explaining the functionality of the lighting dynamo and battery.
| Identifier | ExFiles\Box 61\2\ scan0066 | |
| Date | 18th June 1913 | |
| X 334 Wor{Arthur Wormald - General Works Manager}/SM6/L18.6.13 L. Williamson Esq., Howick, Southport. Dear Sir, X.206 It is with pleasure that we read your letter of June 17th stating that our repair department have entirely overcome the defects in your car, and we are glad that our man has been of service to you in demonstrating the operation of changing gear. With reference to the lighting dynamo, your complete lighting set as specified by you takes about 116 watts approximately to efficiently illuminate all the lamps. The dynamo whwn the armature becomes steady will devlop from 100 to 110 watts, the defficiency, of course, being made up from the battery (the Klaxon is, as you say, only used very occasionally) and so although the current demanded by this is heavy, yet the actual energy is really small) Thus you see that when the full load ie on the circuit the battery is supplying about 2 amperes of current in parallel with the dynamo. This system, of course, is similar to that followed up in standard central lighting station where the maximum load, which occurs for a few hours only during the 24, is greater than the output of the generator, and the excess is met by means of accumulators which are charged when the load is light. You therefore should find that if the dynamo usually runs for several hours before the lights are switched on that it should adequately meet (Contd) | ||