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However, as there are many important problems upon which information can be obtained only by photographic divisions of time at this high rate, all this effort seems well worth while ; as for example, information about the recoil of a gun, the flight of a shell, the impact of a shell against plate, is considered by the Ordnance Department very much worth while.
For the Navy, photographs were made of a big HS2 plane getting off the water. The forty-mile-an-hour travel of the plane at the getting-off moment, when reproduced at normal speed, appeared as but one-half mile an hour, and the pilot, when he saw it, seemed realy distressed about this fact.
I have begun, for myself, the use of this instrument in the study of a physical law, not widely known, I believe, but which may be written as follows :
Any object free to move in a fluid will move toward that part of the fluid having the swiftest motion.
This seems to account for phenomena not explained by any other physical law, for example, why strong swimmers are drowned in the ocean undertow, why logs ride the crest of a freshet, why a ball stays up in a stream of air, why plate glass windows break outward, why leaves are lifted off the ground, even heavy boards picked up and carried long distances, why a card can't be blown off the face of a spool by blowing through the hole in the spool, why birds soar the air without apparent effort, why airplanes are sucked up into the sky, (I believe it is not yet very generally known that 75% of the lift of an airplane is above the wing, and only 25% underenath), and why flags flutter.
I was never entirely satisfied with the explanation which you will remember is given in "Alice in Wonderland," that it was her "Old Man of the Mountain" who furnished "utters for flags, rustles for silk dresses, and a very superior quality of post hole."
It seems more logical to remember the law that the body must move toward the swiftest part of the fluid medium in which it rides, and that this force is as increasingly powerful as the difference in the flow in adjacent parts of the fluid stream. My collection of pictures of this phenomena are not complete, and therefore will not be presented at this time.
However, while the samples I shall show you are of simpler kind very interesting phenomena is disclosed even in these, and it is believed valuable data may be obtained by high speed photographic time divisions in science and engineering when taken up seriously, though scarcely a beginning has yet been made.
Incidentally, it may be interesting to note that an entirely satisfactory means for counting the exposures at this high speed has not yet been worked out, and I do not at the moment recall any problem in science or the arts that has required the development of a timing device dividing the second into a thousand or more parts, which is suitable for this work. I would appreciate suggestions.
The timing device we tried and which you will see in the left
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