Davis's manual of magnetism : including galvanism, magnetism, electro-magnetism, electro-dynamics, magneto-electricity, and thermo-electricity . supported in a horizontal position, with a singlearmature A fitted to vibrate horizontally betweenthem. When the battery connections are made withthe screw-cups on the baseboard, one of the magnetswill be charged, provided the break-piece is in sucha position with regard to the springs as to completethe circuit. The armature will now be attractedtowards the charged poles. Just before it reaches REVOLVING ARMATURE. 207. them, the movement of the break-
Davis's manual of magnetism : including galvanism, magnetism, electro-magnetism, electro-dynamics, magneto-electricity, and thermo-electricity . supported in a horizontal position, with a singlearmature A fitted to vibrate horizontally betweenthem. When the battery connections are made withthe screw-cups on the baseboard, one of the magnetswill be charged, provided the break-piece is in sucha position with regard to the springs as to completethe circuit. The armature will now be attractedtowards the charged poles. Just before it reaches REVOLVING ARMATURE. 207. them, the movement of the break-piece interruptsthe current in the magnet, destroying its polarity,and then causes the current to be transmitted throughthe opposite one; this becomes charged in its turn,and attracts the iron bar, A, which imparts motionto the balance-wheel, W. By means of clock-work,the rotation of the wheel causes a hammer to strikethe bell placed over one of the electro-magnets. 329. Revolving Armature. — In this instrument,invented by Dr. Page, a small bar of iron is arrangedto revolve horizontally just above the poles of anelectro-magnet of the U form, fixed in a vertical po-sition, as seen in Fig. 142, where A is the iron bar, and M the electro-magnet. Tothe axis of motion of the bar isaffixed a break-piece, made byfiling away two opposite sidesof a small solid cylinder of the narrow prominent por-tions thus left, play two silversprings, shown at W in the cut,opposite to each other. One ofthese springs is connected witha screw-cup on the stand; theo
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectmagnetism, bookyear18
