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Crocker's Elements of Land Surveying. to Which Are Added, Tables of Six ...
Abraham Crocker,Richard Farley
Aucun aperçu disponible - 2018
acres added Ansr base bearing begin called centre chain chord circle Co-s common compasses completed construction contained convenient Cosine Cotang cross degrees describe diagonal diameter Diff difference direction distance divided draw drawn equal error Examples for Practice extent feet fence field figure four geometrical give given greater ground half height horizontal inches intersection laid land length less logarithm mark means measured method minutes Multiply natural nearly necessary observation offsets opposite parallel parallelogram perches perpendicular position PROBLEM proportion quantity radius reach reading remaining respective right angles RULE scale segment side Sine square staff station straight subtracted Suppose survey taken Tangent telescope theodolite trapezium trapezoid triangle whole
Page i - CROCKER'S ELEMENTS OF LAND SURVEYING. Fifth Edition, corrected throughout, and considerably improved and modernized, by TG BUNT, Land Surveyor, Bristol. To which are added, TABLES OF SIX-FIGURE LOGARITHMS, &c., superintended by RICHARD FARLEY, of the Nautical Almanac Establishment.
Page 8 - The logarithm of the quotient of two positive numbers is found by subtracting the logarithm of the divisor from the logarithm of the dividend. (6) The logarithm of a power of a positive number is found by multiplying the logarithm of the number by the exponent of the power. For, N" = (oT)
Page 123 - Or, from 8 times the chord of half the arc, subtract the chord of the whole arc, and $ of the remainder will be the length of the arc, nearly.
Page 61 - If a side be required, say, — As the sine of the given angle is to its opposite side, So is the sine of either of the other angles to its opposite side.
Page 274 - Two or more places are on a true level, when they are equally distant from the centre of the earth. Also, one place is higher than another, or...
Page 131 - This figure being a mean proportional between its circumscribed and inscribed circles, that is, equal to a circle whose diameter is a mean proportional between the axes of the ellipse, we...
Page 103 - From half the sum of the three sides subtract each side severally. Multiply the half sum and the three remainders...
Page 40 - Triangles upon equal bases, and between the same parallels, are equal to one another.