The Theory and Practice of Surveying: Containing All the Instructions Requisite for the Skilful Practice of this ArtEvert Duyckinck, 1814 - 508 σελίδες |
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Σελίδα 228
... edge , the point c is in the true place of the extend- ed line . Draw a line from c to D , and it will take in and leave out equally : in like manner the other side of the figure may be balanced by the line e D. Let the point of your ...
... edge , the point c is in the true place of the extend- ed line . Draw a line from c to D , and it will take in and leave out equally : in like manner the other side of the figure may be balanced by the line e D. Let the point of your ...
Σελίδα 264
... edge of a thin ruler , with a fine pointed pair of compasses , take the distance from a to the centre O , and lay it by the ruler's edge from a to A : in the like manner take the distance from the next station b to the centre O , and ...
... edge of a thin ruler , with a fine pointed pair of compasses , take the distance from a to the centre O , and lay it by the ruler's edge from a to A : in the like manner take the distance from the next station b to the centre O , and ...
Σελίδα 265
... edge , will give the points for the enlarged one . And thus may a map be enlarged from a scale of 160 to one of 80 , from one of 80 to one of 40 , from one of 20 to one of 10 perches to an inch , & c . For to enlarge to a scale that is ...
... edge , will give the points for the enlarged one . And thus may a map be enlarged from a scale of 160 to one of 80 , from one of 80 to one of 40 , from one of 20 to one of 10 perches to an inch , & c . For to enlarge to a scale that is ...
Σελίδα 268
... edge of one boundary which is adjoining the other , but not cutting by the edge of both , and throw aside the parts cut off ; then lay these together on a large table , or on the floor , and where the boundaries agree , they will fit in ...
... edge of one boundary which is adjoining the other , but not cutting by the edge of both , and throw aside the parts cut off ; then lay these together on a large table , or on the floor , and where the boundaries agree , they will fit in ...
Σελίδα 282
... edge of the sand , by the depth of water , and then to come to an anchor ; which he is to signify to two persons on the shore , at B and C , by his signal . And then from those known land - marks , B and C , the observers are to take ...
... edge of the sand , by the depth of water , and then to come to an anchor ; which he is to signify to two persons on the shore , at B and C , by his signal . And then from those known land - marks , B and C , the observers are to take ...
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acres altitude Answer arch base bearing blank line centre chains and links circle circle of latitude circumferentor Co-sec Co-tang column compasses contained decimal difference Dist divided divisions draw east Ecliptic edge EXAMPLE feet field-book figures fore four-pole chains geometrical series given angle given number half the sum Horizon glass hypothenuse inches instrument latitude length logarithm measure meridian distance minutes multiplied natural sine Nonius number of degrees object observed off-sets opposite parallelogram perches perpendicular plane pole pole star PROB proportion protractor Quadrant quotient radius right angles right line scale of equal SCHOLIUM screw Secant sect semicircle side sights square root station stationary distance subtracted survey taken tance Tang tangent theo theodolite trapezium triangle ABC trigonometry two-pole chains vane versed sine vulgar fraction whence
Δημοφιλή αποσπάσματα
Σελίδα 52 - The angle in a semicircle is a right angle ; the angle in a segment greater than a semicircle is less than a right angle ; and the angle in a segment less than a semicircle is greater than a right angle.
Σελίδα 39 - The Circumference of every circle is supposed to be divided into 360 equal parts, called Degrees ; and each degree into 60 Minutes, each minute into 60 Seconds, and so on.
Σελίδα 18 - DISTINGUISH the given number into periods of two figures each, by putting a point over the place of units, another over the place of hundreds, and so on, which points shew the number of figures the root will consist of. 2. " FIND the greatest square number in the first, or left hand period...
Σελίδα 120 - C' (89) (90) (91) (92) (93) 112. In any plane triangle, the sum of any two sides is to their difference as the tangent of half the sum of the opposite angles is to the tangent of half their difference.
Σελίδα 31 - DIVISION BY LOGARITHMS. RULE. From the logarithm of the dividend subtract the logarithm of the divisor, and the number answering to the remainder will be the quotient required.
Σελίδα 87 - On the line of lines make the lateral distance 10, a transverse distance between 8 on one leg, and 6 on the other leg. On the line of sines make the lateral distance 90, a transverse distance from 45 to 45 ; or from 40 to 50 ; or from 30 to 60 ; or from the sine of any degree to their complement.
Σελίδα 7 - RULE. Divide as in whole numbers, and from the right hand of the quotient point off as many places for decimals as the decimal places in the dividend exceed those in the divisor.
Σελίδα 82 - ... longer than the intermediate adjacent ones, these are whole degrees ; the shorter ones, or those of the third order, are 30 minutes. From the centre, to 60 degrees, the line of sines is divided like the line of tangents ; from 60 to 70, it is divided only to every degree ; from 70 to 80, to every two degrees ; from 80 to 90, the division must be estimated by the eye.