The Theory and Practice of Surveying: Containing All the Instructions Requisite for the Skilful Practice of this ArtE. Duyckinck, 1811 - 508 σελίδες |
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Αποτελέσματα 1 - 5 από τα 29.
Σελίδα 93
... edge is the diameter of the semicircle , and the mark in the middle points out the centre , in a protractor in the form of a parallel- ogram : the divisions are as in the semicircular one , numbered both ways ; the blank side represents ...
... edge is the diameter of the semicircle , and the mark in the middle points out the centre , in a protractor in the form of a parallel- ogram : the divisions are as in the semicircular one , numbered both ways ; the blank side represents ...
Σελίδα 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 ...
Σελίδα 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 hole ( 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 hole ( 165 )
Σελίδα 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 ...
Σελίδα 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 ...
... 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 ...
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Συχνά εμφανιζόμενοι όροι και φράσεις
acres altitude Answer arch azimuth base bearing blank line centre chains and links chord circle circumferentor Co-sec Co-tang column compasses contained decimal difference distance line divided divisions draw east Ecliptic edge feet field-book figures fore four-pole chains geom given number half the sum Horizon glass hypothenuse inches instrument Lat Dep Lat latitude length logarithm measure meridian distance multiplied natural co-sine natural sine needle Nonius number of degrees object observed off-sets opposite parallel parallelogram pegs perches perpendicular plane pole pole star Portmarnock PROB protractor Quadrant quotient radius right angles right line scale of equal SCHOLIUM screw Secant sect Sextant side sights square station stationary distance subtract Sun's survey taken Tang tangent theo theodolite trapezium triangle ABC trigonometry two-pole chains vane versed sine vulgar fraction whence
Δημοφιλή αποσπάσματα
Σελίδα 38 - 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 25 - The circumference of every circle is supposed to be divided into 360 equal parts, called degrees ; and each degree into 60 equal parts, called minutes ; and each minute into 60 equal parts, called seconds ; and these into thirds, &c.
Σελίδα 197 - RULE. From half the sum of the three sides subtract each side severally.
Σελίδα 106 - 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 27 - The VERSED SINE of an arc is that part of the diameter which is between the sine and the arc. Thus BA is the versed sine of the arc AG.