OC. E. Fritts—New Form of Selenium Cell. 465 
Art. LI.—On a New Form of Selenium Cell, and some Elee- 
trical Discoveries made by its use; by CHARLES E. Frirrs, of 
New York City. 
In the following pages I give, in a condensed form, the 
chief results brought out in a paper presented by me to the 
merican Association for the Advancement of Science, at the 
meeting at Minneapolis in August last. = 
The new form of selenium cell which I have devised has 
the following features: : 
st. Its resistance can readily be made as low as desired. 
Some cells have been made having a resistance as low as nine 
ohms. But I have generally used those measuring between 
500 and 5,000 ohms. 
out previously going through the annealing process. Yet bot 
are supposed to be absolutely chemically pure selenium. The 
conclusion is that commercial selenium is a mixture, consist- 
ted light. The granular or crystalline form also varies,—being 
Am. Jour. Scr.—Turrp Srrtes, Vou. XXVI, No. 156.—Dxc., 1883. 
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