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 26.
Σελίδα 177
... horizon . A theodolite . A surveying compass . Measuring chains , and measuring tapes . King's surveying quadrant . A perambulator , or measuring wheel . A spirit level with telescope . Station staves , used with the level A protracter ...
... horizon . A theodolite . A surveying compass . Measuring chains , and measuring tapes . King's surveying quadrant . A perambulator , or measuring wheel . A spirit level with telescope . Station staves , used with the level A protracter ...
Σελίδα 283
... horizon , its stay will be about 9 seconds , and its distance for this quarter of a mile will be visi- ble about 44 miles . But rockets rise much higher , and then the dis- tances are much greater , whereby they are visible . Or two ...
... horizon , its stay will be about 9 seconds , and its distance for this quarter of a mile will be visi- ble about 44 miles . But rockets rise much higher , and then the dis- tances are much greater , whereby they are visible . Or two ...
Σελίδα 289
... horizon- tal level , whether the instrument be right adjusted or not , because one will be as much above or be- low the true level of the instrument , as the other , being in the same distance from it ; then remove the instrument as ...
... horizon- tal level , whether the instrument be right adjusted or not , because one will be as much above or be- low the true level of the instrument , as the other , being in the same distance from it ; then remove the instrument as ...
Σελίδα 300
... Horizon is the utmost apparent view of the sea or land . The sensible is a plane passing through the eye of an observer , perpendicular to a plumb line harging freely ; And the true or rational Ho- rizon is a plane passing through the ...
... Horizon is the utmost apparent view of the sea or land . The sensible is a plane passing through the eye of an observer , perpendicular to a plumb line harging freely ; And the true or rational Ho- rizon is a plane passing through the ...
Σελίδα 301
... Horizon ; and in either case , the altitude must be reduced to the true Horizon . The Zenith of any given place is the point im- mediately above that place , and is , therefore , the elevated pole of the Horizon : The Nadir is the other ...
... Horizon ; and in either case , the altitude must be reduced to the true Horizon . The Zenith of any given place is the point im- mediately above that place , and is , therefore , the elevated pole of the Horizon : The Nadir is the other ...
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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.