The Theory and Practice of Surveying: Containing All the Instructions Requisite for the Skilful Practice of this ArtEvert Duyckinck, 1814 - 508 páginas |
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Página 93
... edge is the di- ameter of the semicircle , and the mark in the mid- dle points out the centre , in a protractor in the form of a parallelogram : the divisions are as in the semicircular one , numbered both ways ; the blank side ...
... edge is the di- ameter of the semicircle , and the mark in the mid- dle points out the centre , in a protractor in the form of a parallelogram : the divisions are as in the semicircular one , numbered both ways ; the blank side ...
Página 94
... edge , or diameter , ex- actly upon the line ; then the degree upon the limb that is cut by the line will be the measure of the given angle , which , in the present instance , is found to be 60 degrees . 3. From a given point in a line ...
... edge , or diameter , ex- actly upon the line ; then the degree upon the limb that is cut by the line will be the measure of the given angle , which , in the present instance , is found to be 60 degrees . 3. From a given point in a line ...
Página 165
... degree are two numbers , one the number of degrees , the other its complement to 360 . There is another centre hole about of the table's breadth from one edge , and is in the mid- • dle between the two ends . To this centre ( 165 )
... degree are two numbers , one the number of degrees , the other its complement to 360 . There is another centre hole about of the table's breadth from one edge , and is in the mid- • dle between the two ends . To this centre ( 165 )
Página 166
... edge , at each end of which is a sight ; on the ruler are scales of equal parts , with and without diagonals , and a ... edge of the index , so as through the sights you may see the object in the last sta- tion , and by the edge of the ...
... edge , at each end of which is a sight ; on the ruler are scales of equal parts , with and without diagonals , and a ... edge of the index , so as through the sights you may see the object in the last sta- tion , and by the edge of the ...
Página 167
... edge of the index to the second station , direct your sights to the next ; draw a line by the edge of the index , and lay off the next line ; and pro- ceed through the whole without using the needle , as you do with the theodolite . If ...
... edge of the index to the second station , direct your sights to the next ; draw a line by the edge of the index , and lay off the next line ; and pro- ceed through the whole without using the needle , as you do with the theodolite . If ...
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Términos y frases comunes
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
Pasajes populares
Página 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.
Página 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.
Página 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...
Página 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.
Página 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.
Página 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.
Página 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.
Página 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.