. Appleton's dictionary of machines, mechanics, engine-work, and engineering. It will be useful to the student to remember as a general fact, that supposing. Fig. 2695, the observerto be facing the north, N, and the helix A B placed transversely before him so that its axis may lieeast and west, then if the current be descending the coils of the spiral directly before him, the north poleis determined to the right hand, and the south pole to the left. Reciprocally, if the current be ascend-ing the coils of the spiral directly before him, then the south pole is determined to his right hand, andth
. Appleton's dictionary of machines, mechanics, engine-work, and engineering. It will be useful to the student to remember as a general fact, that supposing. Fig. 2695, the observerto be facing the north, N, and the helix A B placed transversely before him so that its axis may lieeast and west, then if the current be descending the coils of the spiral directly before him, the north poleis determined to the right hand, and the south pole to the left. Reciprocally, if the current be ascend-ing the coils of the spiral directly before him, then the south pole is determined to his right hand, andthe north pole to the left. Hence, with a direct helix, the north polo will be always found next thezinc plate, and with a left helix next the copper plate. The magnetic power developed in soft iron closely surrounded by heliacal coils transmitting electricalcurrents all in the same direction is so great, that a curved iron rod, during the action of the battery,may be caused to sustain an enormous weight. The usual form of the experiment is as follows : A cylindrical bolt of
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Keywords: ., bookcentury1800, booksubjectmechanicalengineering, bookyear1861
