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 84
... extended from the centre , shall reach to the fourth proportional 3 . In the same manner a third proportional is found to two numbers . Thus , to find a third proportion- al to 8 and 4 , the sector remaining as in the former I example ...
... extended from the centre , shall reach to the fourth proportional 3 . In the same manner a third proportional is found to two numbers . Thus , to find a third proportion- al to 8 and 4 , the sector remaining as in the former I example ...
Σελίδα 89
... extend the compasses from eight of the larger to eight of the upper small ones , and that distance laid down on the plan will repre- sent eight feet eight inches . Of the scale of equal parts diagonally divided . The use of this scale ...
... extend the compasses from eight of the larger to eight of the upper small ones , and that distance laid down on the plan will repre- sent eight feet eight inches . Of the scale of equal parts diagonally divided . The use of this scale ...
Σελίδα 90
... compasses : thus setting one foot in the number five of the larger divisions , extend the other along the sixth parallel to the seventh diagonal . For , if the five larger divisions be taken for 500 , seven of the 90 MATHEMATICAL "
... compasses : thus setting one foot in the number five of the larger divisions , extend the other along the sixth parallel to the seventh diagonal . For , if the five larger divisions be taken for 500 , seven of the 90 MATHEMATICAL "
Σελίδα 98
... laid down in their proper direction , they would have extended beyond the length of the scale towards the right hand ; they are therefore as it were folded back up- on the tangents below 45 ° , and consequently lie 98 GUNTER'S , & c .
... laid down in their proper direction , they would have extended beyond the length of the scale towards the right hand ; they are therefore as it were folded back up- on the tangents below 45 ° , and consequently lie 98 GUNTER'S , & c .
Σελίδα 107
... extend the first of the foregoing pro- portions ; 1. Extend from 90 ° to 46 ° 30 ' , on the line of sines ; that distance will reach from 250 on the line of numbers , to 181 , for BC . 2. Extend from 90 ° to 43 ° 30 ′ , on the line of ...
... extend the first of the foregoing pro- portions ; 1. Extend from 90 ° to 46 ° 30 ' , on the line of sines ; that distance will reach from 250 on the line of numbers , to 181 , for BC . 2. Extend from 90 ° to 43 ° 30 ′ , on the line of ...
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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.