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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Αποτελέσματα 6 - 10 από τα 16.
Σελίδα 287
... glass cuts the middle of that vane : then see how many feet , inches , and parts , are cut by the upper part of the vane , which suppose to be 3 feet 4 inches and 6 tenths . In like manner direct to the other staff at B , and suppose ...
... glass cuts the middle of that vane : then see how many feet , inches , and parts , are cut by the upper part of the vane , which suppose to be 3 feet 4 inches and 6 tenths . In like manner direct to the other staff at B , and suppose ...
Σελίδα 308
... glass quicksilvered , set in a brass frame , and so placed that the face of it is perpendicular to the plane of the ... glass is designed to reflect the image of the Sun , or any other object , upon either of the two horizon glasses ...
... glass quicksilvered , set in a brass frame , and so placed that the face of it is perpendicular to the plane of the ... glass is designed to reflect the image of the Sun , or any other object , upon either of the two horizon glasses ...
Σελίδα 309
... glass when the 0 on the Nonius is at 0 on the Arch ; these mir- rors receive the rays of the object reflected from the Index glass , and transmit them to the observer , The fore Horizon glass is only silvered on its lower half , the ...
... glass when the 0 on the Nonius is at 0 on the Arch ; these mir- rors receive the rays of the object reflected from the Index glass , and transmit them to the observer , The fore Horizon glass is only silvered on its lower half , the ...
Σελίδα 310
... glass may be used also alone , if the Sun be very faint ; it is likewise used in taking observations of the Moon ; when these glasses are used for the fore ... glass perpendicular to the plane of the Index glass 310 THE QUADRANT .
... glass may be used also alone , if the Sun be very faint ; it is likewise used in taking observations of the Moon ; when these glasses are used for the fore ... glass perpendicular to the plane of the Index glass 310 THE QUADRANT .
Σελίδα 311
... Glass perpendicular to that of the Instrument . Place the Index near to the middle of the Arch , and holding the Quadrant in a horizontal position , with the Index glass close to the eye , look ob- liquely down the glass , in such a ...
... Glass perpendicular to that of the Instrument . Place the Index near to the middle of the Arch , and holding the Quadrant in a horizontal position , with the Index glass close to the eye , look ob- liquely down the glass , in such a ...
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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.