A manual of the mechanics of engineering and of the construction of machines Volume 2, pt. 2, ; with an introduction to the calculus. Designed as a . and for the use of engineers, architects, etc

ISBN 10: 1236434501 / ISBN 13: 9781236434500
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A manual of the mechanics of engineering and of the construction of machines Volume 2, pt. 2, ; with an introduction to the calculus. Designed as a . and for the use of engineers, architects, etc. N° de ref. de la librería

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Sinopsis: 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. 1878 Excerpt: ...CAPACITY, ETC. EXPERIMENTS WITH VERTICAL WATER-TUBE BOILER, ARRANGED WITH REFERENCE TO ECONOMY, CAPACITY, ETC.--Continued). From a careful stndy of experiments similar to those that have been described, the laws governing the performance of boilers can be deduced with considerable accuracy. In tracing these laws, it is best to lay down the several results, and draw curves through them to give fair representations of the average. An investigation of this kind by C. E. Emery may be found in the " Reports and Awards, Group XX., International Exhibition, 1876," and the following paper, by the late Theron Skeel, published in the American Machinist for December, 1877, embodies, in concise form, a number of important rules deduced from such experiments: "The general principles which apply to the setting of steam boilers to obtain the most steam from the smallest quantity of coal are extremely simple, and are as follows: I. The highest chimney. II. The largest grate on which the coal will burn without going out. III. The largest amount of heating surface. IV. The smallest opening through the tubes or flues. "If a man starts out with these principles in view, he may obtain the best results with almost any arrangement of setting, but unfortunately he needs another thing, namely, a large bank account. The problem of obtaining equally good results with a smaller investment of money, is the problem which presents itself to the practical man. "If a builder has unlimited capital at his command, he can scarcely devise any arrangement of boiler setting by means of which he can evaporate more than 12 pounds of water for a pound of anthracite coal after the ashes and cinders are deducted, and when the feed water is fed in boiling hot (212). On the oth...

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1.

Julius Ludwig Weisbach
Editorial: RareBooksClub
ISBN 10: 1130446875 ISBN 13: 9781130446876
Nuevos Paperback Cantidad: 20
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Descripción RareBooksClub. Paperback. Estado de conservación: New. This item is printed on demand. Paperback. 142 pages. Dimensions: 9.7in. x 7.4in. x 0.3in.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. 1878 Excerpt: . . . The water issued under a vertical sluice board, and passed through a guide race o. 8 metre (2 ft. ) long to the wheel. This race, as well as the curb, was of cut stone, and the clearance was only 0. 005 metre (0. 2 inches). The fall was from 0. 78 to 1 metre (3 ft. ), the height back of the sluice was, however, o. 15 to 0. 45 metre (6 to 18 inches). The experiments were made for very different velocities of circumference. For very small velocities, the efficiency was also very small; for the velocity of 1 5 metres (5 ft. ) it was the greatest, and when the velocity of the entering water was not far from v this the greatest efficiency was 0. 49. For--within the limits and f, the mean was exactly as for the preceding wheel 0. 74, and hence we have here also Morin gives the following as the results of his experiments upon curb-wheels: being the total fall and Ji, the fall necessary for the velocity of entrance. Example. --What is the delivery of an undershot curb. wheel 15 ft. in diameter, which makes K 8 revolutions per minute, and has a fall 4 ft. and Q 20 cubic ft. per second The velocity of circumference is If, now, the entering velocity of the water is twice this, we have for the height of water behind the sluice opening hence 7 is only 0-42, and therefore, without reference to axle friction, the delivery is L 0-42 x 3067 1288 ft. lbs. 212. --Wheels in Straight Raee. --The least delivery or mechanical effect is furnished by the undershot-wheel in straight race, because here the water acts by impact alone, and because a considerable quantity of water escapes without producing full effect. Such wheels are applied to small falls of less than 4 ft. , because, in such case, a curb would give but little increase of effect. By reason of their small d. . . This item ships from La Vergne,TN. Paperback. Nº de ref. de la librería 9781130446876

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2.

Julius Ludwig Weisbach
Editorial: Rarebooksclub.com, United States (2012)
ISBN 10: 1130446875 ISBN 13: 9781130446876
Nuevos Paperback Cantidad: 10
Impresión bajo demanda
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Descripción Rarebooksclub.com, United States, 2012. Paperback. Estado de conservación: New. 246 x 189 mm. Language: English . Brand New Book ***** Print on Demand *****. 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. 1878 Excerpt: . The water issued under a vertical sluice board, and passed through a guide race o.8 metre (2$ ft.) long to the wheel. This race, as well as the curb, was of cut stone, and the clearance was only 0.005 metre (0.2 inches). The fall was from 0.78 to 1 metre (3 ft.), the height back of the sluice was, however, o.15 to 0.45 metre (6 to 18 inches). The experiments were made for very different velocities of circumference. For very small velocities, the efficiency was also very small; for the velocity of 1 5 metres (5 ft.) it was the greatest, and when the velocity of the entering water was not far from v this the greatest efficiency was 0.49. For--within the limits and f, the mean was exactly as for the preceding wheel // = 0.74, and hence we have here also Morin gives the following as the results of his experiments upon curb-wheels: // being the total fall and Ji, the fall necessary for the velocity of entrance. Example.--What is the delivery of an undershot curb.wheel 15 ft. in diameter, which makes K = 8 revolutions per minute, and has a fall = 4 ft. and Q = 20 cubic ft. per second? The velocity of circumference is If, now, the entering velocity of the water is twice this, we have for the height of water behind the sluice opening hence 7 is only 0-42, and therefore, without reference to axle friction, the delivery is L = 0-42 x 3067 = 1288 ft. lbs. 212.--Wheels in Straight Raee.--The least delivery or mechanical effect is furnished by the undershot-wheel in straight race, because here the water acts by impact alone, and because a considerable quantity of water escapes without producing full effect. Such wheels are applied to small falls of less than 4 ft., because, in such case, a curb would give but little increase of effect. By reason of their small d. Nº de ref. de la librería APC9781130446876

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3.

Julius Ludwig Weisbach
Editorial: Rarebooksclub.com, United States (2012)
ISBN 10: 1130446875 ISBN 13: 9781130446876
Nuevos Paperback Cantidad: 10
Impresión bajo demanda
Librería
The Book Depository
(London, Reino Unido)
Valoración
[?]

Descripción Rarebooksclub.com, United States, 2012. Paperback. Estado de conservación: New. 246 x 189 mm. Language: English . Brand New Book ***** Print on Demand *****.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. 1878 Excerpt: . The water issued under a vertical sluice board, and passed through a guide race o.8 metre (2$ ft.) long to the wheel. This race, as well as the curb, was of cut stone, and the clearance was only 0.005 metre (0.2 inches). The fall was from 0.78 to 1 metre (3 ft.), the height back of the sluice was, however, o.15 to 0.45 metre (6 to 18 inches). The experiments were made for very different velocities of circumference. For very small velocities, the efficiency was also very small; for the velocity of 1 5 metres (5 ft.) it was the greatest, and when the velocity of the entering water was not far from v this the greatest efficiency was 0.49. For--within the limits and f, the mean was exactly as for the preceding wheel // = 0.74, and hence we have here also Morin gives the following as the results of his experiments upon curb-wheels: // being the total fall and Ji, the fall necessary for the velocity of entrance. Example.--What is the delivery of an undershot curb.wheel 15 ft. in diameter, which makes K = 8 revolutions per minute, and has a fall = 4 ft. and Q = 20 cubic ft. per second? The velocity of circumference is If, now, the entering velocity of the water is twice this, we have for the height of water behind the sluice opening hence 7 is only 0-42, and therefore, without reference to axle friction, the delivery is L = 0-42 x 3067 = 1288 ft. lbs. 212.--Wheels in Straight Raee.--The least delivery or mechanical effect is furnished by the undershot-wheel in straight race, because here the water acts by impact alone, and because a considerable quantity of water escapes without producing full effect. Such wheels are applied to small falls of less than 4 ft., because, in such case, a curb would give but little increase of effect. By reason of their small d. Nº de ref. de la librería APC9781130446876

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