d the disengaging of the steam. The to allow its free movement. air or gas is forced into the boiler by a pump or other valve together, while it permits a slight yielding to | We might cite many illustrations of the waste of prevent unnecessary friction. similar device, and its return is checked by… … which shall utilize the heat in the found that he will lose a force each fire-box, aid in the circulation of day equal to raising a tun-and-a-half ALLEN’S DIAPHRAGM VALVE. weighi several feet from the ground, the water, and thus indirectly in if his hoe’ weighs one ounce too much. The labor It is…
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