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2I Z 'Boy Scouts aS little as possible. All points of contact must be well in- subted with glass, porcelain, or hard rubber. The tuning coil is very simple in'construction. A card- board tube, about three inches in diameter, is mounted. between two square heads. This tube is wound. with No. 24 insulated copper wire and very well shellacked to.&?oi'?loosen- ing of the wire. Two pieces of one quarter inch square brass rod, to be fast- ened between the beads, are secured, and a slider, as shown in drawing, is made. The rods are fastened on the heads and the insulation in the path of the slides is then well scraped off. Binding posts are then fastened to rods and coll ends.
