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).
Page 2 of a letter from an omnibus company discussing repair costs and dynamo/battery maintenance experiences.
| Identifier | ExFiles\Box 60\3\ Scan210 | |
| Date | 15th March 1933 | |
| Form 171A. TELEPHONE: CHELMSFORD 1031. TELEGRAMS: NATIONAL CHELMSFORD. THE EASTERN NATIONAL OMNIBUS CO., LTD. HEAD OFFICE: NEW WRITTLE STREET CHELMSFORD. CHIEF DEPOTS: BEDFORD CHELMSFORD CLACTON COLCHESTER DOVERCOURT DUNSTABLE GRAYS HARWICH HUNTINGDON LUTON STONY STRATFORD WALTON-ON-NAZE F.{Mr Friese} P. ARNOLD. DIRECTORS: JOHN F.{Mr Friese} HEATON. SIR JOHN JARVIS, BT.{Capt. J. S. Burt - Engineer}, CHAIRMAN. (Struck through) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} CARDWELL, M.INST.T. (Struck through) C.J.SELWAY, C.B.E. S.SMITH. H.L.THORNHILL. G.F.THURSTON. ENGINEER'S OFFICE. ANCHOR WORKS, CHELMSFORD. WJM/MLL. - 2 - March 15th, 1933. H.E.West, Esq., Messrs.Rolls-Royce, Ltd. cost a total of £7.18.6d, so that the total cost of repairs to the 335 machines, for one year, was £52.14.11d. This figure of course does not include any small attention which has been given to dynamos in the way of cleaning and inspection. During the year we purchased 12 brushes but our records do not clearly show how many of these were used, so that this figure can be taken as the maximum number of brush renewals for the year. As regards battery maintenance; I have on my own 6-cylinder 20 HP Austin car, a Bosch constant voltage dynamo with vibrating regulator and the battery has been in service for over four years without needing any renewals, and to-day is as lively as when it started. The dynamo purposely has had no attention, as I wish to see how long it will run without having anything done to it. There is no question but that the use of the vibrating regulator constant voltage dynamo, is very kind to batteries and"nurses"a battery in the same way as a skilled electrician would do it. It is most interesting when driving a car fitted with a constant voltage machine, to notice that after using the starter, the amperage rises to say 8 or 9, and within the first mile or so, falls down to 1½ to | ||