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).
Questions and answers guide on using an oscilloscope for machinery analysis, including prices and a list of users.
| Identifier | ExFiles\Box 53\1\ Scan056 | |
| Date | 3rd September 1927 guessed | |
| 20 SOME QUESTIONS AND ANSWERS. Is complete darkness essential, when using the Oscilloscope? No; only comparative darkness over the part which is being examined. The amount of darkness required also largely depends on the speed of the machine examined; for high speeds, less darkness is required than for low speeds. Also, an Operator who is accustomed to using the instrument will require considerably less darkness than a beginner in its use. What is the lowest speed at which parts can be satisfactorily examined? Oil fuel sprayers have been tested when operating at 120 times per minute. This has been done by interposing the sprayer between the Oscilloscope lamp and the eye, so that its action was seen AGAINST the light, and not BY it; also, the lamp shade was covered by tracing paper, so as to prevent glare from striking the eye. This is the lowest speed which has been tried up to the present. What is the highest speed? Parts can be examined at any high speed without limit, but the highest speed at which the Gearbox has been run, up to the present, is 10,000 Rpm. As 10,000 Rpm. is the highest Gearbox speed yet tried, how can a part operating at 20,000 Rpm. be examined? By running the Gearbox at some lower EVEN MULTIPLE of 20,000 Rpm., through gearing if necessary; such as 2,000 Rpm., or 2,500 Rpm., or 4,000 Rpm.; but NOT at 7,500 Rpm., or 8,000 Rpm., as these latter speeds are not EVEN multiples of 20,000 Rpm. since division of one by the other would produce a whole number and a fraction, instead of a whole number only. An example of this is the Spinning Frame where the tin roller usually runs at about 1/10th the speed of the spindles, and yet these spindles can be quite easily examined and their speeds can be definitely ascertained by the Oscilloscope. Can more than one lamp be used with a standard Oscilloscope equipment? Yes; and instructions will be gladly given on request. The above are some questions which are most commonly asked us, but other information may be required by you. YOUR QUESTIONS WILL BE GLADLY ANSWERED. 21 MULTIPLE IMAGES OR FLASHES—(continued). at the same speed as that at which the Gearbox is being driven, either single, double, or quadruple images of the parts will appear. This effect is used for the analysis of vibrations, and also to step-up the number of lamp flashes to synchronise them with other parts which may be operating at correspondingly higher speeds. PRICES. TYPE "A" OSCILLOSCOPE ... ... ... £48 0 0 TYPE "B" OSCILLOSCOPE ... ... ... £36 0 0 SOME MORE USERS. C. A. {Mr Adams} Parsons, Ltd. Power Plant Co., Ltd. Research Association of British Motor & Allied Manufacturers. Ricardo & Co., Ltd. John Ritchie & Co. Rolls Royce, Ltd. Royal Enfield Cycle Co., Ltd. Royal Naval College. D. {John DeLooze - Company Secretary} Napier & Son, Ltd. Standard Motor Co., Ltd. A. {Mr Adams} J. {Mr Johnson W.M.} Stevens & Co., Ltd. Sunbeam Motor Car Co., Ltd. Thomas Tilling, Ltd. University of Durham. Wolseley Motors, Ltd. William Doxford & Sons, Ltd. Vauxhall Motors, Ltd. Vickers, Ltd. JAPAN. Japanese State Railways (8 Instruments). Imperial Japanese Technical School. Imperial Japanese Government Laboratories. L. J. {Mr Johnson W.M.} Healing & Co., Ltd. (10 Instruments). Andrews & George. ITALY. Fiat Motors, Ltd. S.A. Officine Meccaniche Fabbrica Automobili. | ||