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 236
ufficientinfusion of red cabbage to give toit a blue color. Upon the passageof a current of electricity, theblue color will soon be changed tored in the arm containing thepositive pole, and to green in theone containing the negative pole;showing in the former the presence State the supposed process… … ELECTRO-METALLURGY. 231 of sulphuric acid — one of the compound elements of the salt— and, in the latter, that of soda, its other compound element.Now, reverse the current, and the original color will first berestored in each arm of the tube, and then the opposite changewill occur. Experiment a. —…
Physics
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
