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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
ABCD abutment Ansr arithmetical base bearing Bisect centre chain chord circle Circular Segments circumference Co-s construction convenient Cosine Cotang cross decimal diagonal diameter Diff difference direction distance divided draw the line drawn ellipse equal error Euclid Examples for Practice feet fence field field-book figure find the Area geometrical given half sum height horizontal inches instrument intersection land Land-measuring length logarithm mark measured method miii Multiply natural number NATURAL SINES nearly needle nonagon nonius observation offsets opposite ordinates parallel parallel ruler parallelogram perches perpendicular plot polygon Portishead PROBLEM proportion quantity radius regular polygon Required the area rhomboides rhombus right angles right ascension right line roods RULE scale screw sector segment sextant side AC square links staff straight subtract Suppose survey taken Tangent telescope thence theodolite trapezium trapezoid triangle ABC Trigonometry vane vertical
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 63 - 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 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 42 - Triangles upon equal bases, and between the same parallels, are equal to one another.