A natural philosophy : embracing the most recent discoveries in the various branches of physics, and exhibiting the application of scientific principles in everyday life .. (1899)
Quackenbos, G. P. (George Payn), 1826-1881 · New York, Cincinnati [etc.], American book company · leaf 60
enables a person to descend in safety froma balloon at great heights above the earths surface. Aparachute, which spreads open like a large umbrella, is sus- pended beneath the balloon. Hav-ing taken his position in the bas-ket-shaped car hanging beneath,the aerial voyager fearlessly de-taches… … A PARACHUTE. ment? What was its result to Galileo ? 115. What causes the difference of velocity ina falling feather and a falling cent ? To what is the resistance of the air proportioned ?How may the airs resistance almost he made to counterbalance gravity ? Give anillustration. 116. Prove in two…
Physics
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