Experimental observations, and improvements in apparatus and manipulation : with theoretical suggestions respecting the causes of tornadoes, falling stars, and the Aurora borealis (1836)
Hare, Robert, 1781-1858 · Philadelphia, Printed by James Kay, Jun. & Brother · leaf 64
, the hydrogen expels the acid from the cavity of the bell; and, consequently, its reaction with the zinc is prevented, until another por¬ tion of the gas be withdrawn. As soon as this is done, the acid re-enters the cavity of the the bell, and the evolution of hydrogen is renewed and continued… … To complete the circuit, it is only necessary, to depress the handle attached to the pulleys, in order to raise the reservoir of diluted sulphuric acid, and thus to cause it to act on the plates.
University of Pennsylvania. Department of Medicine · Scientific apparatus and instruments -- Design and construction · Acids · Chemistry · Whirlwinds
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