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).
Copy of a letter from Gambrell Bros. Limited regarding a sample electrical testing instrument.
| Identifier | ExFiles\Box 34\1\ Scan320 | |
| Date | 24th August 1922 | |
| V2572 COPY OF LETTER RECEIVED FROM GAMBRELL BROS. LIMITED, (Manufacturers of :- ELECTRICAL TESTING INSTRUMENTS) Merton Road, Southfields, London, S.W.18. Our ref. A O 24th August, 1922. Messrs. Rolls-Royce Ltd., Nightingale Road, DERBY. Dear Sirs, We thank you for your enquiry of the 8th inst. We regret delay in replying to your enquiry but have now made up a sample instrument as our list No. 3103. A deflection of 10 millimetres being obtained by the discharge of a condenser of .3 microfarad charged with a potential of 12 volts. This instrument is the most sensitive pointer instrument that can be made and if you think this deflection of 10 millimetres is not sufficient we would suggest that you have our pattern No. 3121 (page C.G.8) which is fitted with a reflecting mirror for use with lamp and scale and when very sensitive measurements are required this reflecting system can be used which will magnify the pointer deflections by approximately 30. We shall have great pleasure in sending you this sample this sample instrument on approval on hearing from you. Yours faithfully, GAMBRELL BROS. LIMITED. | ||