Coal Miners' Pocketbook: Formerly The Coal and Metal Miners' Pocketbook; Principles, Rules, Formulas and TablesMcGraw-Hill Book Company, Incorporated, 1916 - 1172 páginas |
Dentro del libro
Resultados 1-5 de 100
Página 9
... turned Base Line 10 Feet long the rib of an entry at a point where a branch entry is to be started , in order that there may be room to place the sights . Suppose it is desired to turn an angle of 50 ° to the left . Fasten the 0. WEIGHTS ...
... turned Base Line 10 Feet long the rib of an entry at a point where a branch entry is to be started , in order that there may be room to place the sights . Suppose it is desired to turn an angle of 50 ° to the left . Fasten the 0. WEIGHTS ...
Página 10
... turned from an entry , the points A and B can be lined in from the sights . Then fasten the 30 - ft . mark of the tape at A. This will leave of slack tape between A and B. Find the 19 - ft . mark on the tape , and the tape tight from ...
... turned from an entry , the points A and B can be lined in from the sights . Then fasten the 30 - ft . mark of the tape at A. This will leave of slack tape between A and B. Find the 19 - ft . mark on the tape , and the tape tight from ...
Página 62
... Turning Off the Variation . Moving the vernier to either side , and with of course , the compass circle attached , set the compass to any variation placing the instrument on some well - defined line of the old survey , and turning the ...
... Turning Off the Variation . Moving the vernier to either side , and with of course , the compass circle attached , set the compass to any variation placing the instrument on some well - defined line of the old survey , and turning the ...
Página 63
... turned as a whole . A small conical cen- ter , in which a strong screw is inserted from below , is brought down firmly on the upper end of the main socket c , thus holding the two plates of the instrument securely together , and , at ...
... turned as a whole . A small conical cen- ter , in which a strong screw is inserted from below , is brought down firmly on the upper end of the main socket c , thus holding the two plates of the instrument securely together , and , at ...
Página 65
... turned is deter- mined only by repeated trials . 4 . BL FIG . 2 To make the axis of the attached level of the ... turning the nuts at the ends of the tube , being careful at the same time to keep the telescope in the position that gives ...
... turned is deter- mined only by repeated trials . 4 . BL FIG . 2 To make the axis of the attached level of the ... turning the nuts at the ends of the tube , being careful at the same time to keep the telescope in the position that gives ...
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Otras ediciones - Ver todas
Coal Miners' Pocketbook, Formerly the Coal and Metal Miners' Pocketbook ... Thomas J. Foster Sin vista previa disponible - 2012 |
Términos y frases comunes
amount angle anthracite armature average beam bending bituminous coal boiler bottom British thermal units carbon cars cement center of gravity circuit coal coke column combustion compression concrete cubic curve cylinder diameter distance drill driven electromotive force elevation engine entry equal factor of safety feet formula friction frog fuel gauge given grade haulage head heat hoisting rope holes horizontal horsepower Inches iron length lime load lubrication mantissa material mean effective pressure measured method mines mixture moment of inertia mortar motor obtained pillars pipe piston placed plumb-bob Portland cement Pounds pressure pulley pump radius rail resistance sand seam shaft shear sheaves shown in Fig side slope specific gravity square station steam steel strands strength stress surface switch tangent temperature tests thickness timber track usually valve vertical weight wire
Pasajes populares
Página 3 - SQUARE MEASURE 144 square inches (sq. in.) = 1 square foot (sq. ft.) 9 square feet — 1 square yard (sq.
Página 456 - Z is the space between the piston and the cylinder head (when the piston is at the end of the stroke), toi,-i 8 gether with the volume of the steam ports.
Página 412 - Pi = pressure of steam at discharge, in pounds per square inch; L = length of pipe, in feet; d = diameter of pipe, in inches. In...
Página 204 - This term is applied to the finely pulverized product resulting from the calcination to incipient fusion of an intimate mixture of properly proportioned argillaceous and calcareous materials, and to which no addition greater than 3 per cent has been made subsequent to calcination.
Página 6 - Cubic Measure 1728 cubic inches (cu. in.) =1 cubic foot (cu. ft.) 27 cubic feet = 1 cubic yard (cu. yd.) 128 cubic feet = 1 cord (cd...
Página 34 - Rule. — Divide the logarithm of the number by the index of the root; the result will be the logarithm of the root.
Página 36 - If two triangles have two sides, and the included angle of the one equal to two sides and the included angle of the other, each to each, the two triangles are equal in all respects.
Página 149 - The power multiplied by the distance through which it moves is equal to the weight multiplied by the distance through which it moves. Thus, 20 Ib.
Página 37 - The sum of the interior angles of a polygon is equal to twice as many right angles as the polygon has sides, less four right angles.
Página 303 - The pressure of a liquid on any surface immersed in it is equal to the weight of a column of the liquid whose base is the surface pressed, and whose height is the perpendicular depth of the center of gravity of the surface below the surface of the liquid.