pounds will one that contains one cable foot of hydro gen raise from the ground ? A. About 495 grain. sup posing the India rubber to have no appreciable weight. S. How often must they be replenished if at all? A. There is no rule. It depends upon the rate at which diffusion takes place through the India rubber film. 4. Which is the cheapest way of preparing pure hydro should yield two pounds of hydrogen., scientific american, 1874-08-11
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