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acres altitude Answer arch base bearing blank line centre chains and links circle circumferentor Co-sec Co-tang column compasses contained decimal decimal fraction diameter difference Dist divided divisions draw east Ecliptic edge EXAMPLE feet field-book figures four-pole chains geometrical series given number half the sum Horizon glass hypothenuse inches instrument Lat Dep Lat latitude length line of numbers logarithm measure meridian distance minutes multiplied natural co-sine natural sine Nonius number of degrees object observed off-sets opposite parallelogram pegs perches perpendicular plane pole pole star PROB proportion protractor quadrant quotient radius right angles right line scale of equal SCHOLIUM Secant sect semicircle side sights square root station stationary distance subtract survey taken Tang tangent theo theodolite trapezium triangle ABC trigonometry vane versed sine vulgar fraction whence
Page 40 - 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.
Page 195 - RULE. From half the sum of the three sides subtract each side severally.
Page 2 - Then multiply the second and third terms together, and divide the product by the first term: the quotient will be the fourth term, or answer.
Page 108 - 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.
Page 2 - ... then multiply the second and third terms together, and divide the product by the first term, and the quotient will be the answer ; — in the same denomination with the third term.