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. 1890 Excerpt: ...therefore x--2.5." But the minimum size of pulley that can be used on a dynamo, varies with the capacity from 4 to 10"; suppose, in this case, that it is = 6." It is then impossible to obtain the required velocity ratio with one change of speed, i. e., with one belt. Therefore two changes of speed must be obtained by ...
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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. 1890 Excerpt: ...therefore x--2.5." But the minimum size of pulley that can be used on a dynamo, varies with the capacity from 4 to 10"; suppose, in this case, that it is = 6." It is then impossible to obtain the required velocity ratio with one change of speed, i. e., with one belt. Therefore two changes of speed must be obtained by the introduction of a counter shaft. By this means the velocity ratio is divided into two factors. If it is wished to have the same change of speed from the line shaft to the counter, as from the counter to the dynamo, then each velocity ratio would be /i8o-r-150= /12 = 3.46. But this gives an inconvenient fraction, and there is no need that the two ratios should be equal. Let the factors be 3 and 4. (See Fig. 104.) A represents the line shaft, B the counter, and C the dynamo shaft. The pulley on the line shaft is 30" and the speed is to be three times as great at the counter, and therefore the pulley must have a diameter one-third as great = 10." Also the pulley on the dynamo is 6" diameter, and the counter shaft is to run one-fourth as fast, and therefore the pulley on the counter opposite the dynamo pulley, must be four times as large as the dynamo pulley = 24." A belt may be shifted from one part of a pulley to another, by means of side pressure against the side which advances toward the pulley. Thus if, in Fig. 105, the rotation be as indicated by the arrow, and side pressure be applied at A as shown, the belt will be pushed to one side as is shown by the dotted lines, and will consequently be carried into some new position on the pulley further to the left, as it advances. From this it will be seen, that in order that a belt may maintain its position on a pulley, the centre line of the advancing side of ...
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Add this copy of Notes On a Course of Lectures in Kinematics to cart. $22.29, new condition, Sold by Ingram Customer Returns Center rated 5.0 out of 5 stars, ships from NV, USA, published 2022 by Legare Street Press.
Add this copy of Notes On a Course of Lectures in Kinematics to cart. $33.45, new condition, Sold by Ingram Customer Returns Center rated 5.0 out of 5 stars, ships from NV, USA, published 2022 by Legare Street Press.
Add this copy of Notes On a Course of Lectures in Kinematics to cart. $55.02, new condition, Sold by Booksplease rated 3.0 out of 5 stars, ships from Southport, MERSEYSIDE, UNITED KINGDOM, published 2022 by Legare Street Press.
