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).
Description of Type 'A' and 'B' oscilloscopes with a cross-section of a Type 'A' gearbox and a testimonial from Benz & Cie.
| Identifier | ExFiles\Box 53\1\ Scan054 | |
| Date | 3rd September 1927 guessed | |
| 16 More Testimonials. BENZ & CIE., Mannheim. Im Besitze Ihres Geehrten . . . wir . . . koennen Ihnen mitteilen, dass das . . . vor ca. einem Jahr bezogene Oscilloscop unsere ERWARTUNGEN VOLL UND GANZ ERFUELLT. Die Verwendung des Elverson-Oscilloscopes in der Automobil-und Motorrad-Industrie wird von grossem Nutzen sein, da {Bernard Day - Chassis Design} es bisher mit KEINEM ANDEREN APPARAT MOEGLICH WAR, Bewegungsvorgaenge von schnelllaufenden Maschinenteilen bei jedem beliebigen Punkte des Bewegungsvorganges entweder in beliebig verlangsamtem Tempo oder scheinbarem Stillstand zu beobachten, wobei es wesentlich ist, dass bei diesem scheinbar verlangsamtem Tempo die Beanspruchung der wirklichen Umdrehungszahl entspricht. TYPE 'A' GEARBOX. Cross-section showing the No. 1 Morse Taper in the end of the Gearbox shaft. (For the sake of clearness, the contact-breaker disc is shown 90° away from its true position). 17 Type 'A' Oscilloscope—(continued). If the Gearbox is rotated by hand when switched into the “ Stationary ” position, then successive stationary images will appear, so that a complete cycle of operations will have been shown when the Gearbox has been turned through 360° of angular displacement. Thus, the actual angular positions of defects or irregularities are definitely ascertained in relation to the angular positions of other parts of the machine, at the moments when the defects or irregularities occur. An instance of this nature is the testing of magneto timing, when the actual position of the crank is definitely ascertained in relation to the actual moment of break at the magneto contacts. TYPE “ B ” OSCILLOSCOPE. This instrument is usually employed in cases where it is not essential to have a creeping image which operates at a definite ratio to the actual speed of operation of the machine examined. It is this difference only which makes the type “ B ” instrument not applicable to ALL the uses of the type “A” instrument; there are, however, only a few uses on which the type “ B ” instrument cannot be employed. The type “ B ” Oscilloscope shows only an apparently stationary image of the machine or part but this image, also, can be made to appear at any desired point of the cycle of operations, as in the case of the type “ A ” instrument. It thus follows that one complete cycle of operations is shown, every time that the Gearbox is turned through 360°. The Gearbox can also be allowed to slip in the stand which supports it and a creeping image will then be seen; such a creeping image will, however, not be sufficiently reliable for the analysis of defects or irregularities, because ONLY a mechanically operated creeping arrangement is satisfactory for analysing movements in the “ Creeping ” position. MULTIPLE IMAGES OR FLASHES. Both types of Oscilloscope are so arranged that either one, two, or four flashes of the lamp can be obtained at will; consequently, when viewing parts which are running | ||