Scientific American Volume 59 Number 23 (December 1888) . Fig. EXPEBIMENT. wooden cup containing a globule of mercury, whichtouches a wire leading out of the wood and commu-nicating with one binding post of the sounder ; theother binding post is connected with one pole of thebattery, the remaining pole of which is connected elec-trically with the support of the pendulum. The underside of the pendulum ball is provided with a platinum. r-<- -^ Sci. ^m. N YFig. AND CONICAL PENDTJLTTMS. or copper point, which is capable of just touching themercury globule as the pen
Scientific American Volume 59 Number 23 (December 1888) . Fig. EXPEBIMENT. wooden cup containing a globule of mercury, whichtouches a wire leading out of the wood and commu-nicating with one binding post of the sounder ; theother binding post is connected with one pole of thebattery, the remaining pole of which is connected elec-trically with the support of the pendulum. The underside of the pendulum ball is provided with a platinum. r-<- -^ Sci. ^m. N YFig. AND CONICAL PENDTJLTTMS. or copper point, which is capable of just touching themercury globule as the pendulum swings. By this ar-rangement an electrical contact is made for each swingof the pendulum, and the sounder is made to click eachtime the circuit is closed. By means of Katers reversible pendulum, the lengthof a simple pendulum having the same time of oscilla-tion as the compound pendulum may be accurately de-termined. In Fig. 4 is shown a slightly modified form of thispendulum, in which the rod is formed of two parallelbars of wood, separated by blocks at the ends and pro-vided with two swiveled cylindric rings, betweenwhich are placed two adjustable lead weights, held inplace by crossbars secured to the weights by screws,and extending over the edges of the wooden bars. Be-low the lower swiveled ring are clamped lead weights,one upon either side of the bar, with a screw extendingthrough one weight into the other. These weights arechea
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectaddress, bookyear1888
