Tyndall, John, 1820-1893 · New York, D. Appleton · leaf 50
on rests a short column of coloured liquidi, which is to serve as our index. Placing this portion ofthe narrow tube in the beam of an electric lamp, amagnified image of the index and the adjacent tube is castupon a screen. Through the wires connected with a andB we now send a current from a single… … to be expanded, or, in other words, heat to be developed bythe passage of the current. We now suddenly reverse the latter, causing it to flowfrom bismuth to antimony across the junction. The indexi not only returns to its first position, but passes beyond ittowards the angle formed by the tube.…
Heat
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