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).
Product leaflet for the 'Stroborama' stroboscopic analysis equipment and its attachments.
| Identifier | ExFiles\Box 155\3\ scan0146 | |
| Date | 31th December 1936 guessed | |
| No. 7. Photograph showing the installations required for measuring the shaft torsion of an aeroplane motor by the direct method. (Photograph taken at the Paris Aeronautical Exhibition at the section of the French Military Aviation Services.) A.{Mr Adams} STROBORAMA B. B. & C. Lamps co-ordinated. D.{John DeLooze - Company Secretary} & E.{Mr Elliott - Chief Engineer} Discs. H.{Arthur M. Hanbury - Head Complaints} Torsimeter. Photographic attachment. A special attachment allows of the illuminating power of the “Stroborama” (type A or B) being considerably increased, which enables with a single flash, lasting one millionth of a second, the taking of a photograph of any kind of moving part at the highest speeds. In general any phenomenon not periodic may be photographed by an ordinary camera using ordinary plates. The superimposing on the same plate of several photographs, taken in the same position but at different speeds of the moving part, allows by a direct differential measurement the detection and measuring of all kinds of deformations and vibrations of the latter (torsions, bending, shaft vibrations, vibrations of connecting rods, gear cases etc.) No. 8. Diagram showing the successive positions of each spiral of a valve spring. Cinematograph Attachment for successive photographs stepped. A special arrangement fitted to the “Stroborama” (type A or B) permits of photographs being taken on a cinematographic film, showing the different phases of a periodic phenomenon by a succession of photographs, taken in one millionth of a second with an automatic and very slight stepping of the synchroniser between each photograph. By this means a film is obtained which reproduces phenomena at slow speed and as slowly as desired. Ultra Rapid Cinematographic Attachment. A special arrangement fitted to the “Stroborama” (type A or B) allows of a succession of fifty cinematographic pictures being taken each one millionth of a second at a frequency practically unlimited and which can attain normally 10,000 per second in special cases. No. 9. Photograph showing shaft torsion on an experimental shaft. No. 10. Photographs, time one millionth of a second, showing the different phases of the injection of a Diesel engine, taken with the Stroborama A.{Mr Adams} A.{Mr Adams} at atmospheric pressure. B. at 30 Kgs/sq c.m. (450 lbs./sq inch). No. 11. STROBORAMA, B: 600 candle power. Representatives for Great Britain, Dominions, and Colonies: JAMES COCHRANE & Co., 101 Leadenhall Street LONDON. E.{Mr Elliott - Chief Engineer} C. 3. THE STROBORAMA The latest invention for the immobilisation of movements of different kinds, i. e.{Mr Elliott - Chief Engineer} of machine parts, fluids gases, etc. and for the examination of such movements. No. 1. STROBORAMA A: 1000 candle power. Note on the Stroboscopic Method in general and the application of the “Stroborama”. The Stroboscopic method is a method of analysing periodical rapid movements, which consists of presenting to the eye objects under observation only when they are in the same point of space, and in the same phase of movement, while for the remainder of the time they are invisible. This gives the impression that they are motionless or moving very slowly, if the phase of observation is slightly varied. In fact the different images registered by the eye are connected to each other in much the same way as the pictures recorded by the cinematograph, provided that the images succeed each other sufficiently rapidly. It thus becomes possible by observing the motionless or slowly moving image, to realize phenomena, which are taking place in reality during the movement of the part under observation; such phenomena being normally quite invisible owing to the speed of the moving part. All these particularities of movement can be analysed and all kinds of troubles and irregularities may be observed such as vibrations, jumping, deformations, bending etc. impossible to detect otherwise. In every case the most precise measurements may be | ||