Keely
"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]
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