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 Cambridge and Paul Instrument Co. responding to an enquiry about a 3-pen Chronograph.
| Identifier | ExFiles\Box 138\2\ scan0019 | |
| Date | 13th March 1924 | |
| X4630 BRITISH EMPIRE EXHIBITION WEMBLEY LONDON April-Oct. 1924 CAMBRIDGE AND PAUL INSTRUMENT COMPANY, LIMITED. Codes: A.B.C. (5TH AND 6TH EDITIONS); WESTERN UNION; BENTLEY'S. TELEPHONE VICTORIA 7640 (3 LINES). REGD. TRADE MARK. MANUFACTURERS OF MECHANICAL & ELECTRICAL INSTRUMENTS OF PRECISION WORKS: LONDON & CAMBRIDGE. HEAD OFFICE AND SHOWROOMS: 45, GROSVENOR PLACE, LONDON, S.W.1. YOUR REF. Hs{Lord Ernest Hives - Chair}2/LG IN REPLY PLEASE QUOTE WED/HB{C. E. Harcombe} 13th March 1924 Messrs. Rolls-Royce Ltd., Nightingale Road, DERBY. Dear Sirs, We thank you for your letter of the 12th inst. regarding the 3-pen Chronograph. We enclose a copy of our list 100 in which a fairly full description of this instrument is given. With regard to the recording time intervals, these may be provided by an external contact breaker such as an electrically maintained tuning fork for the special contact breaker which we have already proposed. The instrument itself merely provides a paper speed, and the means of marking the paper, the impulses received from the external source actuating the pens by means of electro-magnets. In the method of measurements of records, the unknown and the standard time markings are obtained side by side on the one strip of paper, and thus the measurement is a comparative one. We trust we have made clear that an auxiliary instrument to provide the necessary time impulses is required. Yours faithfully, FOR THE CAMBRIDGE & PAUL INSTRUMENT CO., LTD. Enc. List 100. | ||