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 Negretti & Zambra regarding a 0 to 350 lbs gauge and technical details of an Acrometer.
| Identifier | ExFiles\Box 40\1\ Scan043 | |
| Date | 21th February 1923 | |
| NEGRETTI & ZAMBRA, OPTICIANS and SCIENTIFIC INSTRUMENT MAKERS. X3695 HEAD OFFICE: 38,HOLBORN VIADUCT, E.C.1. BRANCHES: 5, LEADENHALL ST.{Capt. P. R. Strong},E.C.3. 122,REGENT ST.{Capt. P. R. Strong},W.1. FACTORY: HALF MOON WORKS, BARNSBURY, N.1. FOREIGN BRANCHES: BRUSSELS, OTTAWA, TORONTO, VANCOUVER. FOUNDED 1850. HIGHEST AWARDS AT THE INTERNATIONAL EXHIBITIONS OF LONDON 1851, LONDON 1862, PARIS 1878, PARIS 1900, BRUSSELS 1910, TURIN 1911, GHENT 1913. CABLE: NEGRETTI, LONDON. TELEGRAPHIC ADDRESS: NEGRETTI, CENT, LONDON. TELEPHONE: HOLBORN 583. (BRANCH EXCHANGE) [STAMP: PLEASE QUOTE REF: GAUGE DEPT.] 38, HOLBORN VIADUCT, LONDON, E.C.1 Feby. 21st 1923. [STAMP: RECEIVED FEB 22 1923] Messrs Rolls Royce Ltd., Nightingale Road, DERBY. Dear Sirs, Your favour of yesterday is before us reference Hs{Lord Ernest Hives - Chair}/Rml/LG, and we note that you are returning the small 0 to 350 lbs. Gauge. As we advised you in our last we do not know the price of the separate parts of the Acrometer, but this matter is being investigated, and as soon as we know definitely we will make the necessary adjustment to the invoice already sent you. In reply to your last paragraph, we would say that the clearance in the disc chamber necessary to ensure the gas-tight joint is different when the disc valve is cold to what [handwritten correction: it is] when the disc valve is hot, also a thinner platinum disc is used for cold pressures than for hot pressures, as the latter are contd. | ||