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 Telephone Manufacturing Company proposing the Laryngaphone for communication in noisy engine test sheds.
| Identifier | ExFiles\Box 15\6\ Scan083 | |
| Date | 8th August 1929 | |
| X728. TO AVOID DELAY: ADDRESS ALL COMMUNICATIONS TO THE FIRM—NOT INDIVIDUALS THE.. TELEPHONE MANUFACTURING COMPANY, LIMITED. IN REPLY PLEASE QUOTE: Our Ref..................... Dept. Your Ref.: .............. CONTRACTORS TO British and Dominion Post Offices,—The Admiralty, War Office,—Air Ministry,—India Office,—Crown Agents for Colonies. MANUFACTURERS OF Intercommunication and Automatic Exchange Telephone Equipment. The “Laryngaphone” Ship Telephone. “T.M.C.” Electrical Domestic Appliances. HOLLINGSWORTH WORKS, WEST DULWICH, LONDON, S.E.21 TELEPHONE: SYDENHAM 2460-2461-5693 TELEGRAMS & CABLES: “BUBASTIS, DULCROX, LONDON.” Codes: Bentleys, A.{Mr Adams} B. C. 5th & 6th Editions and Western Union. Messrs. Rolls Royce Ltd., Derby. 8th August 1929 Handwritten note: A/EP{G. Eric Platford - Chief Quality Engineer} This seems to me a reasonable scheme for aero test B.H. Dear Sirs, re Engine Test Shop. As you are aware, your test mechanics have considerable trouble in communicating with each other whilst in the test sheds. With the aid of the LARYNGAPHONE, we have been able to overcome this difficulty, even when two 500 H.P. engines have been on test side by side. As you can see from the enclosed leaflet, the LARYNGAPHONE can be supplied in headset form (leaving both hands free), or as a handset. The LARYNGAPHONE can be fitted as a complete installation, e.g. from test bed to Chief Inspector, or as an addition to your telephone system, (except the G.{Mr Griffiths - Chief Accountant / Mr Gnapp} P. O.{Mr Oldham}) Will you please let us know your problems, and we will submit to you a scheme which will overcome them. We would mention that we have already installed many test bed installations, and would quote one user's words as follows:- "We do not know how we managed before the Laryngaphones were installed". Trusting to be favoured with your enquiries. Yours faithfully, THE TELEPHONE MANUFACTURING CO. LTD., LARYNGAPHONE DEPARTMENT. MEMBER OF THE TELEPHONE DEVELOPMENT ASSOCIATION | ||