Theory and practice of the electric telegraph; a manual for operators and students (1875)
Churchill, Charles Henry, d. 1904. [from old catalog] · Oberlin, Ohio, Sherman & bros. · leaf 30
he electricities will beseparated by the friction, the positive remaining on the glass(which is now said to be excited),, and the negative going tothe rubber. 0. How can negative electricity b? captured? Rub dry sealing wax or ebonite with flannel. The nega-tive remains on the wax and the positive… … A pith ball suspended from aglass support is called a pendu-lum electroscope. The gold leaf electroscope con-sists of two narrow strips of goldfoil suspended together in a glassjar from a metallic rod whichpasses up through the cap andterminates in a metallic plate ora ball. Pith Ball Electroscope.…
Telegraph
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