Allen, Charles Ricketson, 1862- [from old catalog] · New York, H. Holt and company · leaf 237
equired in con-struction. Binding-posts can sometimes be cheaply obtainedfrom old telephone apparatus. Sufficient contact can usually begot by screwing the binding-post nearly in, taking two or threeturns around it with the end of the wire, and then screwing thebinding-post firmly on it. It is… … Fig. 105. I. A support is made of glass tubing or rod bent into theform shown in Fig. 105. This is set into a support of wood about4 in. square and i in. thick (a piece of a cigar-box for example),to which it may be more firmly attached with sealing-wax. Fromthis support a magnetized…
Physics
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