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 170
... altitude is ta- ken in the like manner , by suspending a plummet from the centre thereof , having turned the table on one side , and fixed the index to the centre by a screw , so as to move freely , let the thread cut 90 , look through ...
... altitude is ta- ken in the like manner , by suspending a plummet from the centre thereof , having turned the table on one side , and fixed the index to the centre by a screw , so as to move freely , let the thread cut 90 , look through ...
Σελίδα 179
... altitude by this means , can be acquired with much greater certainty . An angle of altitude may be also taken by any of the instruments used in surveying ; as has been particularly shown in treating of their description and uses . ( 179 ) ...
... altitude by this means , can be acquired with much greater certainty . An angle of altitude may be also taken by any of the instruments used in surveying ; as has been particularly shown in treating of their description and uses . ( 179 ) ...
Σελίδα 180
... altitude , re- quisite to be known in many astronomical cases ; this is effected by letting the sun's ray , which pas- ses through the upper sight , fall upon the hole in the lower one ; and the degree then cut by the thread , will be ...
... altitude , re- quisite to be known in many astronomical cases ; this is effected by letting the sun's ray , which pas- ses through the upper sight , fall upon the hole in the lower one ; and the degree then cut by the thread , will be ...
Σελίδα 181
... altitude , BC the height of the steeple from the instrument , or from the observer's eye , if he were at the foot of it ; DC the height of the steeple above the ho- rizontal surface . Various statings for BC , as in case 2. of right ...
... altitude , BC the height of the steeple from the instrument , or from the observer's eye , if he were at the foot of it ; DC the height of the steeple above the ho- rizontal surface . Various statings for BC , as in case 2. of right ...
Σελίδα 183
... altitude of a perpendicular object , at the foot of a hill , from the hill's side . Turn the centre A of the quadrant , next your eye , and look along the side AC , or 90 side , to the top and bottom of the object ; and noting down the ...
... altitude of a perpendicular object , at the foot of a hill , from the hill's side . Turn the centre A of the quadrant , next your eye , and look along the side AC , or 90 side , to the top and bottom of the object ; and noting down the ...
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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.