Elementary natural philosophy : designed for high schools and academies (1881)
Griffin, La Roy F. (La Roy Freese), 1844-1916 · Philadelphia : Sower, Potts & Co. · leaf 97
spheres two feet in diameter over-came the force of eight horses, four pulling in each direction. The pressure of the air in all directions has been appliedto operate brakes for stopping railroad cars very quickly.A pair of boards connected by leather or rubber made airtight, are ordinarily kept… … Fig. 113. 88 MECHANICS OF GASES.
Physics
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