## Coal and Metal Miners' Pocketbook of Principles, Rules, Formulas, and Tables ... |

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allowed amount angle applied average boiler bottom calculated called carried cars coal column connected cost deposit depth diameter direction distance divided drill driven employed engine equal explosion face feet Find flow foot force formula friction gangway given gives greater head heat hole horizontal inches inclined increased iron lamp length less load lower machine material means measure method mineral mines minute motor necessary obtained opening operation passing piece pillars pipe portion pounds practice pressure pump quantity removed resistance rock roof rooms rope seam shaft shown shows side Sine slope speed split square station steam surface survey taken temperature thickness timber track usually varies ventilation vertical weight wire

### Popular passages

Page 87 - ... viz.: the lever, the wheel and axle, the pulley, the inclined plane...

Page 21 - The square described on the hypotenuse of a rightangled triangle is equal to the sum of the squares described on the sides containing the right angle. Prop. 30. — If the square on one side of a triangle is equal to the sum of the squares on the other two sides, the angle contained by these two sides is a right angle.

Page 28 - Find also the area of the triangle, formed by the chord of the segment and the two radii of the sector.

Page 20 - If two triangles have two angles and the included side of the one, equal to two angles and the included side of the other, each to each, the two triangles will be equal.

Page 337 - Avogadro's hypothesis that equal volumes of all gases under the same conditions of temperature and pressure contain the same number of molecules...

Page 20 - If two triangles have two sides, and the included angle of the one equal to two sides and the included angle of the other, they are equal in all their parts.

Page 21 - The circumferences of circles are to each other as their radii, and their areas are to each other as the squares of their radii. Let C denote the circumference of one of j^ff \ B; the circles, R its radius 0A, A its area ; and let C...

Page 20 - Any Root of a Number, — Divide the logarithm of the number by the index of the root required, and the quotient will be the logarithm of the required root.

Page 18 - Any positive number being selected as a base, the logarithm of any other positive number is the exponent of the power to which the base must be raised to produce the given number. Thus, if a

Page 170 - Place 1 gram of pure bitumen in a " platinum crucible weighing 20 or 30 grams and having a tightly fitting cover. Heat over the full flame of a Bunsen burner for seven minutes. The crucible should be supported on a platinum triangle with the bottom 6 to 8 cm. above the top of the burner. The flame should be fully 20 cm.