Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book . w\ Ay .f» .,/. Fig. 150.—Clock Rules for Polarity Fig. 151.—Magnetic Field of aSolenoid. Made by iron filings upon a horizontalpiece of cardboard. Exp. 55 : Wind a helix about 1 inch in diameter and 4 inches a tongue in a sheet of cardboard equal to the inside diameter ofthe helix, and pass it horizontally through the helix with its planein the axis of the helix. Make a graphical internal field of the direction of the lines of force may also be explored by a com-pa
Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book . w\ Ay .f» .,/. Fig. 150.—Clock Rules for Polarity Fig. 151.—Magnetic Field of aSolenoid. Made by iron filings upon a horizontalpiece of cardboard. Exp. 55 : Wind a helix about 1 inch in diameter and 4 inches a tongue in a sheet of cardboard equal to the inside diameter ofthe helix, and pass it horizontally through the helix with its planein the axis of the helix. Make a graphical internal field of the direction of the lines of force may also be explored by a com-pass needle. 166 PRACTICAL ELECTRICITY. QUESTIONS. 1. A feed wire for the overhead trolley line is conducted upa vertical wooden pole from an underground duct. When youapproach the pole from the S the N-end of a compass needle held inyour hand is deflected east. Is the current flowing up or downthe pole? 2. One end of an arc lamp solenoid attracts the N-pole of a com-pass needle. What is the direction of the current around the coilwhen viewed from this end ? 3. There is a leak to ground on a telegraph line between two
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