Tunzelmann, George William von, 1856- · New York, Scribner & Welford · leaf 105
must not, however, pass from this branch of my subjectwithout giving some account of the work of Mr. (afterwardsSir Francis) Ronalds, who took up the subject of tele-graphy in the year 1816, and published an account of hisexperiments in 1823, in a little volume entitled Descrip-tion of an… … enclosed in thick glass tubes, and laid in wooden troughslined inside and out with pitch, the different lengths ofglass tubing being joined together by short over-lappingtubes, sealed with wax, in order to exclude moisture. The receiving apparatus consisted of a circular brass plate, Fig. i8,…
Electric industries · Electricity
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