The Theory and Practice of Surveying: Containing All the Instructions Requisite for the Skilful Practice of this Art |
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Page 64
... PROB . I. PL . 2. fig . 7 . To make a triangle of three given right lines BO , LB , LO , of which any two must be greater than the third . Lay BL from B to L ; from B with the line BO , describe an arc , and from L with LO describe ...
... PROB . I. PL . 2. fig . 7 . To make a triangle of three given right lines BO , LB , LO , of which any two must be greater than the third . Lay BL from B to L ; from B with the line BO , describe an arc , and from L with LO describe ...
Page 65
... PROB . III . PL . 2. fig . 9 . To bisect or divide into two equal parts , any given right- lined angle , BAC . - In the lines AB and AC , from the point A set off equal distances AE , AD , then , with any dis- tance more than the half ...
... PROB . III . PL . 2. fig . 9 . To bisect or divide into two equal parts , any given right- lined angle , BAC . - In the lines AB and AC , from the point A set off equal distances AE , AD , then , with any dis- tance more than the half ...
Page 66
... PROB . V. PL . 2. fig . 11 . On a given point A , in a right line EF , to erect a perpen- dicular . From the point A lay off on each side , the equal distances , AC , AD ; and from C and D , as cen- tres , with any interval greater than ...
... PROB . V. PL . 2. fig . 11 . On a given point A , in a right line EF , to erect a perpen- dicular . From the point A lay off on each side , the equal distances , AC , AD ; and from C and D , as cen- tres , with any interval greater than ...
Page 67
... PROB . VII . PL . 2. fig . 13 . From a given point A , to let fall a perpendicular upon a given right line BC . From any point D , in the given line , take the distance to the given point A , and with it describe a circle AGE , make GE ...
... PROB . VII . PL . 2. fig . 13 . From a given point A , to let fall a perpendicular upon a given right line BC . From any point D , in the given line , take the distance to the given point A , and with it describe a circle AGE , make GE ...
Page 68
... prob . 2. The angle BAF - AFE , and by theo . 11. BA and CD are parallel . PROB . IX . PL . 1. fig . 17 . Upon a given line AB to describe a square ABCD . Make BC perpendicular and equal to AB ; and from A and C , with the line AB , or ...
... prob . 2. The angle BAF - AFE , and by theo . 11. BA and CD are parallel . PROB . IX . PL . 1. fig . 17 . Upon a given line AB to describe a square ABCD . Make BC perpendicular and equal to AB ; and from A and C , with the line AB , or ...
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Common terms and phrases
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
Popular passages
Page 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.
Page 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.
Page 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...
Page 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.
Page 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.
Page 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.
Page 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.
Page 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.