Manual of Land Surveying, with TablesJ.W. Schermerhorn & Company, 1878 - 259 σελίδες |
Άλλες εκδόσεις - Προβολή όλων
Συχνά εμφανιζόμενοι όροι και φράσεις
9 Diff acres alidade altitude axis azimuth back-sight bubble chains clamp column compute contour lines correction Cosine Sine Cotang course declination circle degrees and minutes determine difference of level direction Dist divided double meridian distance east equal equation error feet field figure find the arc give given ground Gunter's chain height horizontal angle horizontal limb instrument internal angles intersection land latitude circle latitudes and departures length line of collimation line running logarithm magnetic needle marked measure the angles method north and south obtained opposite parallel perpendicular placed plane table plate plot plumb-line position principal meridian radius refraction reverse bearing right angles screws shaft side sights solar compass square star station subtract surface survey surveyor surveyor's compass Tang tangent telescope theodolite threads tion township transit traverse triangle true meridian tube variation vernier vertical
Δημοφιλή αποσπάσματα
Σελίδα 18 - In the same way it may be proved that a : b : : sin. A : sin. B, and these two proportions may be written a : 6 : c : : sin. A : sin. B : sin. C. THEOREM III. t8. 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. By Theorem II. we have a : b : : sin. A : sin. B.
Σελίδα 183 - The minutes in the left-hand column of each page, increasing downwards, belong to the degrees at the top ; and those increasing upwards, in the right.hand column, belong to the degrees below.
Σελίδα 18 - In any plane triangle, the sides are proportional to the sines of the opposite angles.
Σελίδα 13 - 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, etc.
Σελίδα 79 - And the double meridian distance of any course is equal to the double meridian distance of the preceding course, plus its departure, plus the departure of the course itself, having regard to the algebraic sign of each.
Σελίδα 67 - Having measured a distance of 200 feet, in a direct horizontal line, from the bottom of a steeple, the angle of elevation of its top, taken at that distance, was found to be 47° 30'; from hence it is required to find the height of the steeple.
Σελίδα 155 - The characteristic of the logarithm of any number greater than unity, is one less than the number of integral figures in the given number.