Gage, Alfred P. (Alfred Payson), 1836-1903, Fessenden, C · Toronto : W.J. Gage · leaf 81
aper, or letters to be des-patched, are deposited in a cylindrical box c (Fig. 45), whichfits the interior of the tube. The box being dropped into the end of the tubeat fl, and the airbeing exhaustedfrom the tube atthe end b, bymeans of an air-pump worked bysteam, air rushesin at 0 and pushes the…
Physics
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