A text-book on chemistryFor the use of schools and colleges . ELECTROMETEES. 141 Fig. to be preferred when it is required to have exact meas-ures of that quantity. Coulombs electrometer consists of a glass cylinder,A, Fig. 109, upon the top of whichthere is fixed a tube, B, in the axisof which hangs a glass thread, 5,to the lower end of which a smallbar of shellac, b d, with a gilt pitkball at one extremity, is an aperture in the top of:the glass cylinder another shellacrod, 6, with a gilt ball, may be in-troduced. This goes under thename of the carrier. If now the lower
A text-book on chemistryFor the use of schools and colleges . ELECTROMETEES. 141 Fig. to be preferred when it is required to have exact meas-ures of that quantity. Coulombs electrometer consists of a glass cylinder,A, Fig. 109, upon the top of whichthere is fixed a tube, B, in the axisof which hangs a glass thread, 5,to the lower end of which a smallbar of shellac, b d, with a gilt pitkball at one extremity, is an aperture in the top of:the glass cylinder another shellacrod, 6, with a gilt ball, may be in-troduced. This goes under thename of the carrier. If now the lower ball of the car-rier be charged with the electricityto be measured, and introducedinto the interior of the cylinder, asseen in the figure, it will repel themovable ball. By taking hold ofthe button, a, to which the upper end of the glassthread, 5, is attached, we may, by twisting the glassthread, forcibly bring the carrier ball and movable ballinto contact. The number of degrees through whichthe thread requires to be twisted represents the amountof electricity. To the button, a, an ind
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