The elements of natural philosophy : copiously illustrated by familiar experiments and containing descriptions of instruments, with directions for using : designed for the use of schools and academies (1856)
Sprague, A. W. (Alfred White), 1821-1891 · Boston : Phillips, Sampson & Company · leaf 179
on on the electric state ofbodies. The poiiit serves to attract electricityfrom the atmosphere, and so determine itspositive or negative state; while the con-denser attached to the side detects thepresence of slight quantities of the electricfluid, which through its influence show them-selves by… … * The platina sponge attached to the stop-cock in the cut is not used inthese experiments. A mixture of two parts of hydrogen and one of oxygen may be used forfilling these instruments. This forms a compound much more explosive andsure of ignition, and may be used from a bag in which it has been…
Physics
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