The Science record; a compendium of scientific progress and discovery . ck, withtwo brass spherical ends fitted into it, one of which has apipe soldered into it, up which the end of the glass rod Dgoes and fits tight. The rod E has a hole, tapped with ascrew-thread in the upper end, and a screw is put downfrom inside the conductor into this, and secures the con-ductor to the rod. 1 and 2 are disks of ebonite—i being 12 inches, and 2 196 SCIENCE RECORD. being 18 inches in diameter. They are fixed to the axes4 and 3 respectively. 4 is turned by the pulley-wheel andhandle 5, and this pulley-wheel
The Science record; a compendium of scientific progress and discovery . ck, withtwo brass spherical ends fitted into it, one of which has apipe soldered into it, up which the end of the glass rod Dgoes and fits tight. The rod E has a hole, tapped with ascrew-thread in the upper end, and a screw is put downfrom inside the conductor into this, and secures the con-ductor to the rod. 1 and 2 are disks of ebonite—i being 12 inches, and 2 196 SCIENCE RECORD. being 18 inches in diameter. They are fixed to the axes4 and 3 respectively. 4 is turned by the pulley-wheel andhandle 5, and this pulley-wheel drives 2 at a rate six timesas fast as 4 goes round. The rate of the upper disk maybe more than this, but should not be less. The lower diskis £ inch thick, the upper one a full TV- The axes are ofwood, with brass fittings at the ends. The band in the figure is represented as crossed, but itis no matter which way 2 turns. At G is a collar of brass,with a pinching screw to hold it on the rod E, and thiscollar carries the pin at the end of the axle 3, on which it F. CARRES ELECTRICAL MACHINE. turns. H is a brass pipe carried by a similar collar, andcarrying the comb for collecting the electricity as near aspossible to the surface of 2 ; at the other end is a bell K,capable of rotating stiffly on its axis, carrying the brasswire J, with a ball at the top, which can be thus made totouch the conductor or be fixed at any distance from I is a comb attached to the conductor ; and on the oth-er side at O a piece of ebonite, about 2\ inches long and 1inch wide, is attached to the conductor parallel with thedisk 2, and having on the side next the disk a piece ofvarnished paper cemented to it with four or five pointscut on the edge of the paper, which is somewhat wideron one side than the ebonite plate, so that these points ELECTRICITY, LIGHT, HEAT, SOUND. 197 are projecting in the direction in which the disk 2 is turn-ing. A correspondent says that he put this apparatus tohis in
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Keywords: ., bookcentury1800, bookdecade1870, booksubje, booksubjecttechnology
