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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 circle Co-s common compasses construction contained convenient Cosine Cotang cross degrees describe diagonal diameter Diff difference direction distance divided division draw drawn equal error Examples for Practice Extend fall feet fence field field-book figure four geometrical give given greater ground half height horizontal inches intersection land length letters logarithm mark means measured method minutes Multiply natural nearly necessary observation offsets opposite parallel parallelogram perches perpendicular placed plot position PROBLEM proportion quantity radius reading remaining represented respective right angles road RULE scale segment sides Sine square staff station straight subtract 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 125 - 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 272 - 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 133 - 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 105 - 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.