File:The fireside university of modern invention, discovery, industry and art for home circle study and entertainment (1902) (14592181140).jpg

Identifier: firesideuniversi01mcgo (find matches)
Title: The fireside university of modern invention, discovery, industry and art for home circle study and entertainment
Year: 1902 (1900s)
Authors: McGovern, John. (from old catalog)
Subjects: Science
Publisher: Chicago, Union pub. house
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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EARS. Next let us see how the shaft is built up. The LaminatedCore is first built. On the slim steel shaft is put a heavy cast-iron disk, in which are bolt-holes. Then a mica-disk is strungon; then a thin sheet-iron disk; then mica again, and thin sheetiron again, until at last a second heavy cast-iron plate finishes.Then these disks are bolted together and the whole shaft turnedsmooth in a lathe. This is done to secure a cool shaft, or itwould set up so many currents of its own that it would burnout. (See Figs, n and 12.) What come next ? The wires—just as we passed the wire in the Magnetic Fieldbefore the Magnet—are now to be passed, only with extraordi-nary speed and in great numbers. They are cut in pieces as longas the set of disks, and each heavy wire is covered with some 34 THE FIRESIDE UNIVERSITY. body of matter that does not readily carry Electricity. As theRoman bundle of sticks could not be broken when boundtogether, so the union of all these short wires increases their
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FIG. 10, DIAGRAM TO ILLUSTRATE THE THEORY OF THEBRUSH DYNAMO. The bobbins Al and A5 are two opposite coils, oonnected to a slit collar. Each pairof opposite coils is similarly connected with its own collar, and all the collars are groupedin two sets, forming the commutators Cl, C2; Al and A5 are connected with the first collar,A3 and Al with the second, A2 and A6 with the third, and A4 and A8 with the fourth. Thecollars 1 and 2 form the first, and the oollars 3 and 4 the second commutator. The upperbrush of the first and the lower of the second commutator lead to the arms of magnets,the others to the outer circuit. When the bobbins Al A5 are passing between the poles ofthe magnets, the current passes as follows: Starting from the bobbin Al, it passes to Cl,thence through the brush Bl, to the electro magnets N2, Kl, Si, S2, in order, and thenback toB2 and the commutator C2, thence through the brush B3 to the external circuit for light-ing or trolley, thence to B4 and commutator Cl to A

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