Formulae for the Calculation of Railroad Excavation and Embankment and for Finding Average HaulGilliss Bros., 1877 - 106 páginas |
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applied approx ascer average haul borrow-pit centre height centre of gravity cols column computation consecutive considered convenient corresponding breaks cross-section cut or fill decimal diagram difference distance divide by 27 earthwork elev end areas end sections end volume end-section equal error example excavation factors fading ends field-book followed by interms full stas full widths Gillespie's grade line half widths haulage Henck's intersection irreg JOHN WOODBRIDGE last break last interm left slope length of vol level-section measurements mid-section monthly estimates notes obtain parallel pris prismoidal formula Prof represent result ridge or hollow ridges and hollows road-bed rule Sb² side side-heights side-widths single vols slope and base straight line subtraction surface line TABLE OF OPERATIONS table of prods tion trapezoids triangle true content V₁ values vanishing end warped surface wedge width and centre widths and prods zero
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Página 98 - If the quotient obtained by dividing the sum of these products by the...
Página 8 - ... represent width and centre at next station, the area of its cross-section may be expressed by a formula similar to the above : half the sum of these, multiplied by dist., D, between, and divided by 27, gives a near approximate of the volume bet. in cu. yds. B@- Vol. - (we+w'c1 + Sb(w + iu')-4:SI?)T™Add two consecutive volumes of equal length by means of the general formula, w",c", representing the width and centre of third cross-section : Vol. = (we + 2w/c' + w"c" + Sb(w + 2w/ + iv") - SSff)^.
Página 8 - Supposing w', c' to represent width and centre at next .station, the area of its cross-section may be expressed by a formula similar to the above : half the sum of these, multiplied by dist., D, between, and divided by 27, gives a near approximate of the volume bet. in cu. yds.
Página 3 - T*ook has been adopted as a text-book in the SCHOOL OF MINES of COLUMBIA COLLEGE...
Página 106 - The centre of gravity of the paraboloid, whose height is /(, and the radius of whose base is...