Lynde, Carleton John, b. 1872 · New York : Macmillan · leaf 91
air, and since theengineer controls the compressed air, he controls all the brakeson the train. Pneumatic tubes. — In many cities the maU is distributed tothe sub-postofl5ces through pneumatic tubes. These aresmooth tubes placed underground. The mail is placed in cylin-ders which just fit these… … Fig, 56. — The diving bell. AIR APPLIANCES 77 Pintsch gas system.—The gaslight on trains is an applica-tion of the fact that gases are very compressible. Ordinary-illuminating gas is compressed under high pressure in tanksunder the cars. It escapes through an automatic valve whichregulates the…
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