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acres altitude Answer arch base centre chains and links circle circumferentor Co-sec Co-tang column compasses contained decimal Dep Lat difference 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 io.o io.of io.oo io.oz Lat Dep latitude length logarithm measure meridian distance multiplied Nonius number of degrees object observed off-sets parallel parallelogram perches perpendicular plane pole pole star PROB protractor Quadrant quotient radius right angles right line root scale of equal screw Secant sect semicircle side sights sine square station stationary distance subtract Sun's survey taken Tang tangent theo theodolite to.o toº trapezium triangle ABC trigonometry vane versed sine vulgar fraction
Página 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.
Página 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...
Página 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.
Página 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.
Página 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.
Página 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.
Página 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.