Davis's manual of magnetism : including galvanism, magnetism, electro-magnetism, electro-dynamics, magneto-electricity, and thermo-electricity . crew-cups fixed at the ends Fig. 159. of the troughs. Thepoints of two wires, A andB, rest in the oppositecompartments of thetroughs. This modeof support allows thewires to be placednearer to or fartherj from each other, atD pleasure, still remain-ing parallel. Thesewires are balanced bytwo brass balls, b b,attached to them be-low, which are capa-ble of being raised or depressed by means of a screwcut on the wire; they may thus be so adju
Davis's manual of magnetism : including galvanism, magnetism, electro-magnetism, electro-dynamics, magneto-electricity, and thermo-electricity . crew-cups fixed at the ends Fig. 159. of the troughs. Thepoints of two wires, A andB, rest in the oppositecompartments of thetroughs. This modeof support allows thewires to be placednearer to or fartherj from each other, atD pleasure, still remain-ing parallel. Thesewires are balanced bytwo brass balls, b b,attached to them be-low, which are capa-ble of being raised or depressed by means of a screwcut on the wire; they may thus be so adjusted thatthe wires will be moved from their vertical positionby a very slight force, their upper portions rockingtowards or away from each other, without requiringany motion of the points of support. 365. Cups O and E, being united by a copperwire, connect cups D and F with the galvanic bat-tery. The current will now traverse A a,nd B insuccession, flowing in the same direction in both,and they will be seen to incline towards each motion is slight, but may be made considerableby breaking and renewing the circuit in correspond-20. 230 DA viss MANUAL. ence with their oscillations. The same effect isproduced by uniting D with F, and connecting Oand E with the battery. If a powerful current isemployed, the wires still attract each other whenseparated to a considerable distance, by moving thepoints which rest in the mercury to the farther endsof the cells; with a feeble battery, the wires shouldbe placed near to one another. 366. Let the cup C now be united with D, and Eand F be connected with the battery. This willcause the current to flow in opposite directions inthe two wires, and they will recede from each other;the extent of the motion may be increased, as before,by alternately opening and closing the circuit. CupsC and D may be connected with the battery with thesame result, E and F being united by a wire. 367. The current, instead of traversing the wiresin successio
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectmagnetism, bookyear18
