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. 1903 Excerpt: ... end of the shaft must be bent out enough so that there will be about 5 of an inch clear space between it and the commutator. At the other end it need only clear the end of the winding by the thickness of a washer, which you must place there to keep the wire from rubbing. The wire must be carefully insu lated from the ...
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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. 1903 Excerpt: ... end of the shaft must be bent out enough so that there will be about 5 of an inch clear space between it and the commutator. At the other end it need only clear the end of the winding by the thickness of a washer, which you must place there to keep the wire from rubbing. The wire must be carefully insu lated from the washer by cloth and shellac. A small grooved pulley should be placed upon the end of the shaft opposite to that on which the commutator is. CHAPTER IX. After putting the armature in place in the fields the whole should be fitted to a base board, as shown, holes being tapped in the pole pieces by which it can be screwed to the board. Make the brushes of two pieces of spring brass and fasten them as shown in the drawing, where for sake of clearness the armature support is removed. (See -Fig. 4.) You will need two binding posts on the base board of the machine. To one of them connect one end of the field winding; the other end of the field winding is to be connected to one of the brushes and the other brush must be connected to the other binding post. We are now ready to start up. See that the brushes press firmly against the commutator. Their ends should be bent slightly out so that they may not catch in the slots, and the points of con tact on the commutator should be diametrically opposite. Connect your source of current to the binding posts, and if every thing is properly made the armature should commence to revolve. Three or four Bichromate Cells should run this at a pretty good speed, and it ought to give enough power to run a fan or any other small piece of machinery. It will not do to run it too slowly if you have a large electro-motive force, as it is likely to burn out. HOW TO MAKE A DYNAMO. The dynamo and motor are theoretically i...
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Seller's Description:
Very Good. Very good hardcover. Later printing. New revised and enlarged edition. Twenty-First Thousand. Illustrated. Name inside front cover. Pages light brown, clean text. Corners bent. Edges of spine bumped. Please Note: This book has been transferred to Between the Covers from another database and might not be described to our usual standards. Please inquire for more detailed condition information.
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Seller's Description:
Very Good. First edition. 12mo. 104pp. Russet cloth boards. Very good with rubbing and small ink stain on the rear board, small damp mark on front board, and rear hinge starting, with tiny bookseller ticket and two early neat owner names at the front. One name is that of Wallace F. Powers, who was head of the physics department at Amherst College and also worked at General Dynamics Electric Boat, the primary builder of submarines for the U.S. Navy. Powers worked on the Nautilus, the first nuclear submarine. Uncommon early guide to electricity with chapters on how to make an electrical battery, electric bell, electric motor, and induction coil, with a hand written list of the material for making a telegraph instrument their cost laid in.