ISBN: 9781150904875

RareBooksClub. Paperback. New. This item is printed on demand. Paperback. 154 pages. Dimensions: 9.7in. x 7.4in. x 0.3in.This historic book may have numerous typos and missing text. Pur… Más…

RareBooksClub. Paperback. New. This item is printed on demand. Paperback. 154 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. 1905 Excerpt: . . . two for hoisting. If there is a reasonable probability of a large output, it is best to sink the three-compartment shaft at once. The size of the hoisting compartment is determined by the size of the cage or skip to be used. 43. Number of Shafts. --If it is desired to remove the deposit quickly, several shafts will be required, each shaft having its own hoisting equipment. 44. It is common practice, where several shafts are sunk, to remove the ore quickly, to have no ladderway in the hoisting shafts, thus reducing the danger of fire (the ladder compartments always being the hardest in which to fight fire), special ladderway and pumpway shafts being provided for the mine. 45. Arrangement of Compartments. --If several rectangular compartments are used, it is best to place them Fig. B. Fig. 6. side by side rather than in a compact block, as the former arrangement gives the greatest resistance to crushing. (See Figs. 5 and 6. ) 46. Form of Shaft. --When shafts are to be timbered, they are usually rectangular. When the lining is composed of brick, stone, or iron, the form is usually round or elliptical, as this gives greater strength with these materials than would be afforded by the square or rectangular form. The objection to the curved outline is that all the area is not available for hoisting. 47. Shaft Templet. --Before commencing to sink, the shaft site should be graded off level by cutting away all Fig. . inequalities of surface, and long sills should be laid on each side of the proposed opening. Cross-pieces are framed into these sills, making a rectangular frame (Fig. 7), which constitutes a templet of the shaft, and serves as a foundation for whatever timbering is required at the collar. Its inner surface is flush with the inner face of the shaft curbing. . . . This item ships from La Vergne,TN., RareBooksClub, RareBooksClub. Paperback. New. This item is printed on demand. Paperback. 114 pages. Dimensions: 9.7in. x 7.4in. x 0.2in.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. 1905 Excerpt: . . . the Constitution in any event, nevertheless put away his oldtime imperiousness, and pleaded as he had never pleaded before for mutual accommodation and agreement. Even Webster, slackened a little in his constitutional convictions by profound anxiety for the life of the Constitution itself, urged compromise and concession. Calhoun, equally anxious to preserve the Constitution, but convinced of the uselessness to the South of even the Constitution itself, should the institutions of southern society be seriously jeoparded by the action of Congress in the Southern pro-matter of the Territories, put forth the programme, gramme of the southern party with all that cold explicitness of which he was so consummate a master. The maintenance of the Union, he solemnly 1850. Compromise debated. 171 declared, depended upon the permanent preservation of a perfect equilibrium between the slave holding and the free States: that equilibrium could be maintained only by some policy which would render possible the creation of as many new slave States as free States; concessions of territory had already been made by the South, in the establishment of the Missouri compromise line, which rendered it extremely doubtful whether that equilibrium could be preserved; the equilibrium must be restored, or the Union must go to pieces; and the action of Congress in the admission of California must determine which alternative was to be chosen. He privately advised that the fighting be forced now to a conclusive issue; because, he said, we are stronger now than we shall be hereafter, politically and morally. Still more significant, if possible, --for they spoke the aggressive purposes of a new party, --were the speeches Seward and of Senator Seward of New York, and Senator Chase. C. . . This item ships from La Vergne,TN., RareBooksClub<