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 from the Eastern National Omnibus Co. Ltd. discussing the dynamos and regulators used in their fleet.
| Identifier | ExFiles\Box 60\3\ Scan209 | |
| Date | 15th March 1933 | |
| Form 171A. x6092 4693 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, HINGDON, LUTON, STONY STRATFORD, WALTON-ON-NAZE DIRECTORS: F.{Mr Friese} P. ARNOLD, SIR JOHN JARVIS, BT.{Capt. J. S. Burt - Engineer}, CHAIRMAN, G.{Mr Griffiths - Chief Accountant / Mr Gnapp} CARDWELL, J.{Mr Johnson W.M.} H.{Arthur M. Hanbury - Head Complaints} FOLLOWS, C.B.E., M.V.O., JOHN F.{Mr Friese} HEATON, C. J.{Mr Johnson W.M.} SELWAY, C.B.E., B. SMITH, M.{Mr Moon / Mr Moore} H.{Arthur M. Hanbury - Head Complaints} L. THORNHILL, G.{Mr Griffiths - Chief Accountant / Mr Gnapp} F.{Mr Friese} THURSTON. ENGINEER'S OFFICE. ANCHOR WORKS, CHELMSFORD. WJM/MLL. March 15th, 1933. H.E.West, Esq., Messrs.Rolls-Royce, Ltd. DERBY. Dear Sir, I have heard from Mr.Iden and also from yourself over the 'phone, that you would like some particulars of the Constant Voltage Dynamos with vibrating regulators, which are used on the Eastern National Omnibus Company's fleet. The dynamo we principally use is a Bosch machine with an output of 225 or 300-watts for Single-deckers and 400-watts, for Double-deckers. In addition to these Bosch machines, we also use a small number (approximately 30), of the CAV."M" type, which also has a vibrating regulator. My reason for selecting the Bosch type of machine was that the regulator is attached to the dynamo and therefore the whole electricity generator is in one unit, which simplifies maintenance and wiring. The CAV."M" type has the regulator separate from the dynamo and therefore in my opinion, more likely to derangement, more especially as the CAV.regulator can be interfered with by drivers, whereas on the Bosch design it is sealed up and difficult of access. During the year of 1932 we had approximately 335 Bosch machines in service, and a total of 26 dynamos, repaired, at a total cost of £44.16.5d. Nine regulators were repaired separately from the dynamos and these | ||