![]() Into this tapering part a small tube is cemented, the lower extremity G of which being also covered with sealing-wax, projects a short way within the tube CDMN. upper part of the tube CDMN, is shaped tapering to a smaller extremity, which is entirely covered with sealing-wax, melted by heat, and not dissolved in spirits. The principal part of this instrument is a glass tube CDMN, cemented at the bottom into the wooden piece AB, by which part the instrument is to be held when used for the atmosphere and it also serves to screw the instrument into its wooden case ABO, fig. ' of Mr Cavallo’s improved atmospherical electrometer, of half its real size. But there are several instruments of this kind that have not been described in that article j and as they are well deserving a place in this work, either from the ingenuity of their construction, the reputation of their inventors, or the intrinsic value of the instruments themselves, we shall give an account of them here. ![]() In various parts of the article ELECTRICITY, we have described a great variety of instruments for ascertaining the presence of electricity, and measuring its quantity or proportion. They were at the mouth of the Po, according to Apollonius of Rhodes j but some historians doubt of their existence. ELECTRIDES, anciently islands in the Adriatic sea, which received their name from the quantity of amber (electrum) which they produced. Sllustrntri) luitf) nrarli) Gtr bunirrt (Cngrabmuss.ĮDINBURGH: PRINTED FOR ARCHIBALD CONSTABLE AND COMPANY AND HURST, ROBINSON, AND COMPANY, LONDON. DICTIONARY ARTS, SCIENCES, AND MISCELLANEOUS LITERATURE ENLARGED AND IMPROVED.
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