Reprint of papers on electrostatics and magnetism . r than theLeyden jar, attached to a metal ring borne by its inside coat-ing, and standing up vertically to a few inches above the levelof the mouth of the jar. (8.) A stiff wire projecting horizontally from this metal tubeabove the edge of the Leyden jar, and out through a wide holein the case of the instrument to a convenient position forapplying electricity to charge the jar with. (9.) A very light glass mirror, about three-quarters of aninch diameter, attached by its back to the wire (4.), and there-fore rigidly connected with the aluminiu
Reprint of papers on electrostatics and magnetism . r than theLeyden jar, attached to a metal ring borne by its inside coat-ing, and standing up vertically to a few inches above the levelof the mouth of the jar. (8.) A stiff wire projecting horizontally from this metal tubeabove the edge of the Leyden jar, and out through a wide holein the case of the instrument to a convenient position forapplying electricity to charge the jar with. (9.) A very light glass mirror, about three-quarters of aninch diameter, attached by its back to the wire (4.), and there-fore rigidly connected with the aluminium needle. (10.) A circular aperture in the case shut by a convex lens,and a long horizontal slit shut by plate glass, with its centre im-mediately above or below that of the lens, one of them above,and the other equally below the level of the centre of the mirror. (11.) A large aperture in the wide metal tube (7.), on a levelwith the mirror (9.), to allow light from a lamp outside thecase, entering through the lens, to fall upon the mirror, and be. XVI.] A tmosjjheric Electricity. 211 reflected out througli the plate-glass window; and three orfour fine metal wires stretched across this aperture to screenthe mirror from irregular electric influences, without sensiblydiminishing the amount of light falling on and reflected off it. 271. The divided ring (1.) is cut out of thick strong sheetmetal (generally brass). Its outer diameter is about 4 inches,its inner diameter 2|; and it is divided into two equal parts bycutting it along a diameter with a saw. The two halves arefixed horizontally; one of them on a firm metal support, andthe other on glass, so as to retain as nearly as may be theiroriginal relative position, with just the saw cut, from tV to ^of an inch broad, vacant between them. They are placed withtheir common centre as nearly as may be in the axis of thecase (5.), which is cylindrical, and placed vertically. The Leydenjar (3.), and the tube (7.), carried by its inside
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectmagnetism, bookyear18
