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To make such a coil (Fig. 27), proceed as follows: Prepare a spool by gluing a paper or fibre tube 3/4 inch in outside diameter by about 1-16 inch thick into square or round spool ends three inches square, one-half inch thick, and having each a centre hole just large enough to admit of the tube being held tightly.
...When the spring R touches the adjustment screw A at B, as they are insulated from each other, contact is made and reference to circuit will show that the current from battery L flows through primary coil, magnetizing the core and attracting soft iron hammer on R.