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
... 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 compasses be kept to the last ...
... 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 compasses be kept to the last ...
Σελίδα 230
... true content of a survey , though it be taken by a chain that is too long or too short . Let the map be constructed , and its area found as if the chain were of the true length . And it will be , As the square of the true chain Is to ...
... true content of a survey , though it be taken by a chain that is too long or too short . Let the map be constructed , and its area found as if the chain were of the true length . And it will be , As the square of the true chain Is to ...
Σελίδα 239
... merid . ( east } multiplied ( northings Dist . when west into the southings the sum of these products taken from the former gives the area of the map . These theorems are true , when the surveyor keeps the OF AREAS . 239.
... merid . ( east } multiplied ( northings Dist . when west into the southings the sum of these products taken from the former gives the area of the map . These theorems are true , when the surveyor keeps the OF AREAS . 239.
Σελίδα 240
... true , when the surveyor keeps the land he surveys , on his right hand , which we suppose through the whole to be done ; but if he goes the contrary way , call the south- ings northings , and the northings southings , and the same rule ...
... true , when the surveyor keeps the land he surveys , on his right hand , which we suppose through the whole to be done ; but if he goes the contrary way , call the south- ings northings , and the northings southings , and the same rule ...
Σελίδα 260
... true as is protracted ; but if this as well as the foregoing intersection diverge or fly from the point of concourse or converging point of the rest , the error must have its rise from some station or stations , at or after that , from ...
... true as is protracted ; but if this as well as the foregoing intersection diverge or fly from the point of concourse or converging point of the rest , the error must have its rise from some station or stations , at or after that , from ...
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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.