The time rate of change of displacement. This is often expressed as V, x, or dx/vt; velocity leads displacement by 90 degrees in time. Typical units for velocity are inches/second or millimeters/second, zero-to-peak. Velocity measurements are usually obtained with a mechanically activated velocity transducer and are used to evaluate machine housing and other structural response characteristics. Electronic integration of a velocity displacement signal. (Bentley Nevada Corporation, Field of Rotating Machinery Measurement, Monitoring and Analysis)

Velocity of Sound in Gas
The speed of sonorous vibrations through gases varies inversely as the square root of the weights of equal volumes of the gases, or, in other words, in the inverse ratio of the square roots of their densities. [Appleton's School Physics, page 377]

"To move suddenly a square inch of air at the velocity of his vibratory circuit, on full line of graduation and at a vibration only of 2,750,000 per second, would require a force at least of twenty-five times that of gunpowder, and at 21,000 lbs. per sq. inch it would be 525,000 lbs. per square inch. The finer the substance the greater the power and velocity under such vibrations." [Snell Manuscript - The Book, page 2]

"All needs to be done is to secure a uniform speed under different velocities and control reversions .. some few years ago, I contemplated using a wire as a connective link between two sympathetic mediums, to evolve this power as also to operate my machinery - instead of tubular connections as heretofore employed - I have only recently succeeded in accomplishing such change. This, however, is the true system ... henceforth ... the power will be generated, my engines run, my cannon operated, through a wire." [Snell Manuscript - The Book, page 3]

S. Zolver Preston, in his "Physics of the Ether" says: "A quantity of matter only 1 gram and of the normal velocity of the ether, or a wave of light encloses a state of energy represented by 1,000,000,000 foot tons. Or the mass of a grain contains an energy sufficient to project a weight of 100 tons to a height of 1.9 miles." [Snell Manuscript - The Book, page 3]

"That tuning forks can be so constructed as to show coincident or concordant association with each other, is but a very weak illustration of the fact which governs pure acoustic assimilation. The best only approach a condition of about a fortieth, as regards pure attractive and propulsive receptiveness. By differentiating them to concordant thirds, they induce a condition of molecular bombardment between themselves, by alternate changes of long and short waves of sympathy. Bells rung in vacuo liberate the same number of corpuscles, at the same velocity as those surrounded by a normal atmosphere, and hence the same acoustic force attending them, but are inaudible from the fact that, in vacuo, the molecular volume is reduced. Every gaseous molecule is a resonator of itself, and is sensitive to any and all sounds induced, whether accordant or discordant." [Snell Manuscript - The Book, GRADUATION OF MACHINES, page 5]

See Also

Snells Law
Table 9.1 - Velocity of Sound in various Materials
Velocity of Sound
Velocity Transducer
9.12 - Velocity of Sound and its Propagation Rate are Proportional
9.2 - Wave Velocity Propagation Questions

Created by Dale Pond. Last Modification: Saturday January 16, 2021 05:19:51 MST by Dale Pond.