The Theory and Practice of Surveying: Containing All the Instructions Requisite for the Skilful Practice of this Art |
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Page 80
... marked LIN . or L. Each of these scales , from the great ex- tensiveness of its use , is called the line of lines . 2. Two lines of chords , marked CHO . or c . 3. Two lines of secants marked SEC . or s . A line of poly- gons , marked ...
... marked LIN . or L. Each of these scales , from the great ex- tensiveness of its use , is called the line of lines . 2. Two lines of chords , marked CHO . or c . 3. Two lines of secants marked SEC . or s . A line of poly- gons , marked ...
Page 87
... marked CHо . 2. A line of sines marked SIN . of tangents marked TAN . of semitantan- gents marked ST . and of secants marked sEc . this last is often upon the same line as the sines , because its gradations do not begin till the sines ...
... marked CHо . 2. A line of sines marked SIN . of tangents marked TAN . of semitantan- gents marked ST . and of secants marked sEc . this last is often upon the same line as the sines , because its gradations do not begin till the sines ...
Page 90
... marked by the diagonal upon the parallels , hundreth parts of the unit . But , if we suppose the larger divisions to be tens , the first subdivisions will be units , and the second tenths . If the larger are hundreds , then will the ...
... marked by the diagonal upon the parallels , hundreth parts of the unit . But , if we suppose the larger divisions to be tens , the first subdivisions will be units , and the second tenths . If the larger are hundreds , then will the ...
Page 91
... marked up- on the arch , will form the required angle . The degrees contained in an angle already laid down , are found nearly in the same manner ; for instance , to measure an angle . From the centre describe an arch with the chord of ...
... marked up- on the arch , will form the required angle . The degrees contained in an angle already laid down , are found nearly in the same manner ; for instance , to measure an angle . From the centre describe an arch with the chord of ...
Page 93
... marked , is chamfered or sloped away to the edge , that an angle may be more easily measured , and the divisions set off with great- er exactness . Application of the protractor to use . 1. A num- ber of degrees being given , to ...
... marked , is chamfered or sloped away to the edge , that an angle may be more easily measured , and the divisions set off with great- er exactness . Application of the protractor to use . 1. A num- ber of degrees being given , to ...
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Common terms and phrases
acres altitude Answer arch azimuth base bearing blank line centre chains and links chord circle circumferentor Co-sec Co-tang column compasses contained decimal difference distance line divided divisions draw east Ecliptic edge feet field-book figures fore four-pole chains geom given number half the sum Horizon glass hypothenuse inches instrument Lat Dep Lat latitude length logarithm measure meridian distance multiplied natural co-sine natural sine needle Nonius number of degrees object observed off-sets opposite parallel parallelogram pegs perches perpendicular plane pole pole star Portmarnock PROB protractor Quadrant quotient radius right angles right line scale of equal SCHOLIUM screw Secant sect Sextant side sights square station stationary distance subtract Sun's survey taken Tang tangent theo theodolite trapezium triangle ABC trigonometry two-pole chains vane versed sine vulgar fraction whence
Popular passages
Page 38 - 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 25 - 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, &c.
Page 197 - RULE. From half the sum of the three sides subtract each side severally.
Page 106 - 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 27 - The VERSED SINE of an arc is that part of the diameter which is between the sine and the arc. Thus BA is the versed sine of the arc AG.