. The American artist's manual; . may be opposite the unmarked end B ;then place the two attracting poles G andI on the middle of one of the bars to betouched, raising the ends, so that thebars may form an obtuse angle of 100 or120 degrees; the ends ii ajidl of the bars MAG MAG are to be separated two or three tenths df jan inch from each other Keeping- the jbars in this position, move them slowly iover the bar A B, from one end to the ;other, going- from end to end about fifteentimes. Huving done this, change thepoles of the bars (i e. the marked end ofone is always to be against the unmarked
. The American artist's manual; . may be opposite the unmarked end B ;then place the two attracting poles G andI on the middle of one of the bars to betouched, raising the ends, so that thebars may form an obtuse angle of 100 or120 degrees; the ends ii ajidl of the bars MAG MAG are to be separated two or three tenths df jan inch from each other Keeping- the jbars in this position, move them slowly iover the bar A B, from one end to the ;other, going- from end to end about fifteentimes. Huving done this, change thepoles of the bars (i e. the marked end ofone is always to be against the unmarkedend of the other), and repeat the sameoperation on the bar C D, and then on theopposite faces of the bars. The touchthus communicated may be further in-creased, by rubbing the different faces ofthe bars with sets of magnetic bars, dispos-ed as in fig. In these operations all the pieces shouldbe well polished, the sides and ends madequite flat, and the angles quite square. A magnet, bent so that the two endsalmost meet, is called a horse-shoe mag-net. To render it magnetic, place a pairof magnetic bars against the ends of thehorse-shoe, with the south end of the baragainst that of the horse-shoe which isintended to be the north, and the northend of the bar to that which is to be south :the contact, or lifter of soft iron to beplaced at the other end of the bars. Alsorub the surfaces of the horse-shoe with apair of bars placed in the form of a com-pass, or with another horse-shoe magnet,turning the pole properly to the poles ofthe horse-shoe magnet; being careful thatthese bars never touch the ends of thestraight bars. If the bars are separatedsuddenly from the horse-shoe magnet, itsforce will be considerably diminished : toprevent this, slip on the lifter, or support,to the end of the horse-shoe magnet, butin such a manner, however,
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Keywords: ., bookcentury1800, bookdecade1810, bookidame, booksubjecttechnology
