A manual of chemistry : containing a condensed view of the present state of the science, with copious references to more extensive treatises, original papers, &c: intended as a text-book for medical schools, colleges, and academies . e just incontact. The cone H is then depressed toany desired distance which may be varied atwill during an experiment. The same coneis connected with the inner coating of a Ley-den jar, the outer coating of which communi-cates with the frame AA, and along DCIwith the cone G; these cones may thus bemade parts of a charged Leyden jar, and beoppositely excited, as in
A manual of chemistry : containing a condensed view of the present state of the science, with copious references to more extensive treatises, original papers, &c: intended as a text-book for medical schools, colleges, and academies . e just incontact. The cone H is then depressed toany desired distance which may be varied atwill during an experiment. The same coneis connected with the inner coating of a Ley-den jar, the outer coating of which communi-cates with the frame AA, and along DCIwith the cone G; these cones may thus bemade parts of a charged Leyden jar, and beoppositely excited, as indicated by the signs -f- and — . The attractive forces between their bases tends to drawdown the cone G into contact with H discharging the jar ; but beforeit can do so, it has to overcome the weight which may be in the scaleE. By this ingenious contrivance any number of attractive forces areestimated by a common standard, namely, the number of grains whicheach is able to raise.— Turner. Mr. Harris has also invented another instrument which he calls theUnit Jar, the principal use of which is in charging other Leyden jarswith known proportions of electricity. The most perfect eledrometer for measuring small quantities of7*. 78 ELECTRICITY. electricity, is the apparatus described by Coulomb, and to which hehas given the name of the Torsion Balance, for a description of whichwe must refer to elementary works on Natural Philosophy, or to theLibrary of Useful Knowledge, art. Electricity. EFFECTS OF ELECTRICITY. Independently of electrical attraction and repulsion, it does not ap-pear that the simple accumulation of electricity in any quantity In bod-ies, as long as it remains quiescent, produces the least sensible changein their properties. A person standing on an insulating stool, maybe charged with any quantity of electricity from a machine, without be-ing perceptibly affected, until the equilibrium of the fluid is disturbed,by drawing sparks from his body or from the prime co
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