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 xviii
... Rock from Face , 575 . Slopes . Safety Appliances , 575 ; Data Concerning Well - Known Sl Table , 576-577 . Shafts ... Rock , 583 ; Through Rock , 584 ; Long - Hole , or Continuous - l Method , 585 ; Sinking in Swelling Ground , 586 ...
... Rock from Face , 575 . Slopes . Safety Appliances , 575 ; Data Concerning Well - Known Sl Table , 576-577 . Shafts ... Rock , 583 ; Through Rock , 584 ; Long - Hole , or Continuous - l Method , 585 ; Sinking in Swelling Ground , 586 ...
Página xix
... Rock Work . - Straight Nitroglycerin Dynamite , 668 ; Com- positions , Table , 668 ; Slow , or Low - Freezing ... Rocks , 694 ; CONTENTS xix.
... Rock Work . - Straight Nitroglycerin Dynamite , 668 ; Com- positions , Table , 668 ; Slow , or Low - Freezing ... Rocks , 694 ; CONTENTS xix.
Página xx
... Rock Pressure , 707 ; Choice of Timb 707 ; Room Timbering in Flat Seams , 707 ; Props , 707 ; Systema Timbering , 708 ; Bad Roofs , 709 ; Supporting the Face While Und cutting , 710 ; Entry Timbering in Flat Seams , 710 ; Two - Stick Se ...
... Rock Pressure , 707 ; Choice of Timb 707 ; Room Timbering in Flat Seams , 707 ; Props , 707 ; Systema Timbering , 708 ; Bad Roofs , 709 ; Supporting the Face While Und cutting , 710 ; Entry Timbering in Flat Seams , 710 ; Two - Stick Se ...
Página 68
... rock . In this case , a hole some 12 in . deep is drilled in the rock and a bolt of 1 - in . or 1 - in . round iron is leaded into it , the head of the bolt being allowed to project 1 or 2 in . above the rock . The bolt is center ...
... rock . In this case , a hole some 12 in . deep is drilled in the rock and a bolt of 1 - in . or 1 - in . round iron is leaded into it , the head of the bolt being allowed to project 1 or 2 in . above the rock . The bolt is center ...
Página 116
... rock cut , it is possible to make a stable embank- ment with a slope ratio of 1 : 1 . On side - hill work , where a slope ratio of 14 : 1 or even 1 : 1 might require a very long slope , it is often advisable to make a rough dry wall of ...
... rock cut , it is possible to make a stable embank- ment with a slope ratio of 1 : 1 . On side - hill work , where a slope ratio of 14 : 1 or even 1 : 1 might require a very long slope , it is often advisable to make a rough dry wall of ...
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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.