M. HOPKINS. To rivet scientific facts in the mind, study and prac- The upper wire is 24 inches long between its connec- A glass shade protects the delicate parts of the in- strument. The two binding posts which are outside tions, the lower one 2% inches. tice must proceed together. This is… … cylinder. poles of the mag- To a block attached to the base, opposite the center net and the iron down the upper silver wire, then through the coil, the cylinder. The terminals of the coil are soldered to the of the magnet, is secured a tapering spring, ?; inch lower silver wire, and the spring to…
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