The Theory and Practice of Surveying: Containing All the Instructions Requisite for the Skilful Practice of this Art |
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Page 39
... arch ( that is , any part of the circum- ference of a circle ) to the other ; and is the measure of the arc . Thus the right Thus the right line HG , is the mea- sure of the arc HBG . fig . 8 . 18. The segment of a circle is any part ...
... arch ( that is , any part of the circum- ference of a circle ) to the other ; and is the measure of the arc . Thus the right Thus the right line HG , is the mea- sure of the arc HBG . fig . 8 . 18. The segment of a circle is any part ...
Page 77
... arch or circle is to be described the steel points are best adapted to the price . I it is to be in ink or black seat aer de Cang pen , or crayon pics are to be used To use a pair of computer . Place the cum am middle finger of the ...
... arch or circle is to be described the steel points are best adapted to the price . I it is to be in ink or black seat aer de Cang pen , or crayon pics are to be used To use a pair of computer . Place the cum am middle finger of the ...
Page 78
... arches or circles , which they do much more con- veniently than large compasses , not only on account of their size , but also from the shape of the head , which rolls with great ease between the fingers . f the drawing pen and ...
... arches or circles , which they do much more con- veniently than large compasses , not only on account of their size , but also from the shape of the head , which rolls with great ease between the fingers . f the drawing pen and ...
Page 79
... arch or circle is to be described , of more than an inch radius , the point should be so bent , that the blades of the pen may be nearly perpendicular to the paper , and both of them touch it at the same time . The protracting pin , is ...
... arch or circle is to be described , of more than an inch radius , the point should be so bent , that the blades of the pen may be nearly perpendicular to the paper , and both of them touch it at the same time . The protracting pin , is ...
Page 80
... arches they describe . Sectors are made of different sizes , but their length is usually denominated from the length of the legs when the sector is shut . Thus a sector of six inches , when the legs are close together , forms a rule of ...
... arches they describe . Sectors are made of different sizes , but their length is usually denominated from the length of the legs when the sector is shut . Thus a sector of six inches , when the legs are close together , forms a rule of ...
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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.