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acres altitude Answer arch base blank line centre chains and links circle circumferentor Co-sec Co-tang column compasses contained decimal Dep Lat difference divided divisions Dºp draw east Ecliptic edge feet field-book figures four-pole chains Geometrical series given number half the sum Horizon glass hypothenuse inches instrument io.o io.of Lat Dep latitude logarithm Lºt measure meridian distance minutes multiplied Nonius number of degrees object observed parallel parallelogram perches perpendicular plane pole pole star PROB protractor quadrant quotient radius right angles right line root scale of equal Secant sect semicircle side ſig sights sine square station stationary distance subtract Sun's survey taken Tang tangent theo theodolite to.o Toº Tºp trapezium triangle ABC trigonometry vane versed sine vulgar fraction
Página 46 - 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.
Página 209 - RULE. From half the sum of the three sides subtract each side severally.
Página 8 - 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.
Página 114 - 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.
Página 8 - ... 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.