Gage, Alfred P. (Alfred Payson), 1836-1903 · Boston, London, Ginn · leaf 628
ntroducing a cell C containing a solution ofiodine which has the property of absorbing light-bearing waves,found that the results were not affected thereby. He thereforeconcluded that light-giving radiations are not essential to the suc-cessful operation of this apparatus, and consequently gave it… … Fig. 493. invented by Prof. M. G. Farmer, and by him first introduced intoBoston in the year 1852. From some central station wires radiate to every part of thecity. At suitable intervals there are inserted in these circuits smallcottage-shaped boxes, usually attached to buildings at the cornersof…
Physics
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