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By a sufficiently accurate practical rule this velocity is eight times the square root of the head or vertical column measured in feet. The graphic method of showing velocities or pressures has many advantages, and is used in all the following diagrams. Beginning with purely theoretical considerations, we must first recollect that there is no such thing as absolute motion.
He has thus been enabled by working in vacuo to register the very different velocities which, starting in the case of certain rays from about seven-tenths of the velocity of light, attain in other cases to ninety-five hundredths of it.
Some seem to rise out of a mist, as it were, and to become clearer. Others grow feebler. Some are split in two. Some are rotated through a right angle in a minute or less, although each of the grains may be the size of Great Britain. Generally they move together in groups of very various velocities, up to forty kilometres a second.
All modern guns are capable of being made to shoot straight; but their precision of range depends partly on the successful designing of the gun and ammunition, so as to give uniform velocities, and partly on the flatness of the trajectory. The greater the velocity, the lower the trajectory, and the greater the chance of striking the target.
"Would tell the general?" Mr. Tucker prompted. "Well, did he?" "I believe he did, sir," Captain Meford said. He let out a long breath. "May we see the aliens?" Mr. Ryan asked. "I wouldn't advise it, sir," Captain Meford said. "High flights are still very risky because of the wind velocities." After the evening meal, General Shorter called Captain Arnold aside.
In our first advertisement we said: Our purpose is to construct and market an automobile specially designed for everyday wear and tear business, professional, and family use; an automobile which will attain to a sufficient speed to satisfy the average person without acquiring any of those breakneck velocities which are so universally condemned; a machine which will be admired by man, woman, and child alike for its compactness, its simplicity, its safety, its all-around convenience, and last but not least its exceedingly reasonable price, which places it within the reach of many thousands who could not think of paying the comparatively fabulous prices asked for most machines.
The relative mobility of a European population and the Japanese population might be expressed by a comparison between certain high velocities of vibration and certain low ones. But the high velocities would represent, in such a comparison, the consequence of artificial force applied; the slower vibrations would not.
If this idea can be entertained, meteors must be vastly more numerous than the world has supposed. Cosmical space, according to Mr. Lockyer, is filled with meteorites of various sizes, flying in many directions with enormous velocities and moving in certain orbits like larger bodies. Many observations have been made to determine the number of these meteorites. Dr.
Copeland and J. G. Lohse succeeded in identifying six brilliant rays in the green and yellow with as many prominent iron-lines; a very significant addition to our knowledge of cometary constitution, and one which lent countenance to Brédikhine's assumption of various kinds of matter issuing from the nucleus with velocities inversely as their atomic weights.
Later experiments with falling bodies led to the discovery of laws regarding the accelerated velocity of fall. Such velocities were found to bear a simple relation to the period of time from the beginning of the fall.
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