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
... Horizon 175 5. Method of surveying by Intersections Dip for Dif . Dist of land 257 Semidiameter of the Sun ibid . 6. Changing the scale of Maps Transit of Pole Star 176 263 Difference of Altitude of 7. Method of Dividing Pole Star and ...
... Horizon 175 5. Method of surveying by Intersections Dip for Dif . Dist of land 257 Semidiameter of the Sun ibid . 6. Changing the scale of Maps Transit of Pole Star 176 263 Difference of Altitude of 7. Method of Dividing Pole Star and ...
Σελίδα 137
... which is most usual ) as d is over A , while the leader puts down his peg at e the eye can direct the horizon- tal position near enough , but if greater accuracy T were required , a quadrant applied to the chain , OF THE CHAIN . 137.
... which is most usual ) as d is over A , while the leader puts down his peg at e the eye can direct the horizon- tal position near enough , but if greater accuracy T were required , a quadrant applied to the chain , OF THE CHAIN . 137.
Σελίδα 138
... horizon- tal ones ; for all trees which grow upon any inclined surface , do not grow perpendicular thereto , but to the plane of the horizon : thus if Ad , ef , gh , & c . were trees on the side of a hill , they grow per- pendicular to ...
... horizon- tal ones ; for all trees which grow upon any inclined surface , do not grow perpendicular thereto , but to the plane of the horizon : thus if Ad , ef , gh , & c . were trees on the side of a hill , they grow per- pendicular to ...
Σελίδα 152
... horizon nearly , when the instrument is horizontal , and the needle at rest . The box is covered with a glass lid , in a brass rim , to prevent the needle being disturbed by wind or rain , at the time of surveying : there is also a ...
... horizon nearly , when the instrument is horizontal , and the needle at rest . The box is covered with a glass lid , in a brass rim , to prevent the needle being disturbed by wind or rain , at the time of surveying : there is also a ...
Σελίδα 169
... horizon ; let the instrument be placed in this situa- tion before the object , so that the top thereof may be seen through the sights ; let a plummet be sus- pended from the centre pin , and the object being then observed , the ...
... horizon ; let the instrument be placed in this situa- tion before the object , so that the top thereof may be seen through the sights ; let a plummet be sus- pended from the centre pin , and the object being then observed , the ...
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Συχνά εμφανιζόμενοι όροι και φράσεις
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.