Trebel, George. [from old catalog] · New York, F. Tousey · leaf 25
es of the wire, and the needle will swing backto the usual position. If a piece of paper is interposed be- 18 HOW TO MAKE AND tvreen the ends of the wire, no deflection of the needlewill Occur. Take a large iron nail, and plunge one end of it into ironfilings, and then remove it; no filings cling… … nect the wire with the copper and zinc as before, so that therewill be a continuous connection from one strip to the other-through the coil, and dip one end of the nail again into thefilings, raise the nail and a considerable quantity of filingsclings to the nail. The copper strip is frequently…
Electricity
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