This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1910 Excerpt: ...this. When it is essential that the apparatus should be made of any particular size, the dimensions will be carefully given; where this is not done it is to be understood that the size may be varied to suit the convenience of the operator. The first piece of apparatus required is some machine ' or instrument for easily ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1910 Excerpt: ...this. When it is essential that the apparatus should be made of any particular size, the dimensions will be carefully given; where this is not done it is to be understood that the size may be varied to suit the convenience of the operator. The first piece of apparatus required is some machine ' or instrument for easily generating electricity. We will here describe two such appliances, either of which is well within the grasp of the enthusiastic amateur. 25. The Induction Coil.--As for experimental work it will not be necessary to use a spark of greater length F than," the following dimensions refer to a coil of this capacity. The material required for its construction are--a bundle of straight iron wires, No. 22 B.W.G., sufficient to make up a core f" in diameter, and about 6" long; lb. No. 20 d. o. c. copper wire for the primary winding, and about f lb. No. 36 silk-covered copper wire for the secondary winding; a piece of ebonite tube of about f" internal and 1 " external diameter, 5J" longj to slip over the primary when wound on the core; two ebonite heads, 3" square and about f" thick, to make the ends of the bobbin; one sheet of thin ebonite, about No. 24 gauge, 5" wide, 14" long, for covering the coil when finished; 1 lb. of paraffin wax for insulation; about 50 sheets of good demy paper, which after being paraffined will serve both for making the condenser and for separating the different layers of the secondary winding; lb. tinfoil wherewith to make up the condenser; one foot of f" hard brass rod for contact pillars, eta; of No. 16 platinum wire for the contacts; 4 No. 2 post office terminals; a piece of brass tube about 1." long, 1" diameter, and thick, in the shell; 1 pie...
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