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).
Page illustrating schlieren and high-speed photography of sound waves, heat plumes, and projectiles.
| Identifier | ExFiles\Box 143\3\ scan0192 | |
| Date | 1st April 1940 guessed | |
| 17 Two sound waves of different intensities were generated simultaneously and photographed by the Toepler method. The picture shows that the wave of greater intensity (lower) spreads more rapidly than does the other. Warm air rising above a burning candle is made visible by photography. The author tells how you can make similar pictures with your own camera. Right: Not a burning oil tank, but a small vessel filled with ether. Rising vapors are clearly shown. The air jet (right) was used to hasten vaporization. A setup of amateur equipment for taking simple streak pictures, in this case, the heated air rising above a burning candle. The method is explained in the text and illustrated by Fig. 1 on page 74. High-speed exposure of a projectile in the air. Head and tail waves, as well as the eddies in the trajectory, are clearly shown. Illumination by electric spark; the exposure time, one-millionth of a second. Photo of a bullet passing between two parallel plates; (the two black lines) shows reflections of head and tail waves. This type of high-speed shot requires the use of very elaborate equipment. | ||