A practical treatise on mining, land and railway surveying, engineering, &c, 第 35 巻 |
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多く使われている語句
angle of depression angles of direction angles of elevation axis base A B bisect calculated centre chain clamp column compass constructed Cosecants cosine Cotangents cross hairs curve Degrees and Minutes difference of level distance A B Ditto ditto draw the line electrum equal Example.-Given false stations feet find the Angle geometrical progression geometrical series given ground Hypothenuse incline instrument last terms added length limb line A B line C D Logarithm radius lower plate mark Measured Distance meridian miner's transit theodolite multiplied Natural tangent needle Office Form parallel parallel ruler perpendicular plane of latitude plotting angle plumb-bob PROBLEM protractor release the upper right angles right-angled triangle scale Secants shaft side A C spirit level surface survey survey-book surveyor tangent screw tangential angle transit axis traverse trigonometry tunnel underground upper plate vernier vertical circle yards zero دو وو
人気のある引用
40 ページ - Subtract the logarithm of the divisor from the logarithm of the dividend, and obtain the antilogarithm of the difference.
46 ページ - As the base or sum of the segments Is to the sum of the other two sides, So is the difference of those sides To the difference of the segments of the base.
37 ページ - Where it is evident, that the same indices serve equally for any geometric series ; and consequently there may be an endless variety of systems of logarithms to the same common numbers, by only changing the second term 2, 3, or 10, &c. of the geometrical series of whole numbers...
38 ページ - And, if the logarithm of any number be divided by the index of its root, the quotient will be equal to the logarithm of that root.
24 ページ - The SINE of an arc is a straight line drawn from one end of the arc, perpendicular to a diameter which passes through the other end.
63 ページ - ... to the middle, the limb is horizontal in that direction; but if otherwise, half the difference must be corrected by the parallel plate-screws over which the telescope lies, and half, by elevating or depressing the telescope, by turning the tangent-screw...
25 ページ - In a right triangle each side is equal to the product of the hypotenuse into the sine of the opposite angle or the cosine of the adjacent angle.
45 ページ - The side opposite the given angle is to the side opposite the required angle as the sine of the given angle is to the Bine of the required angle.