The Theory and Practice of Surveying: Containing All the Instructions Requisite for the Skilful Practice of this Art |
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Page 78
... plane , on which they are used . The ink and crayon points have a joint just un- der that part which fits into the compasses , by this they may be always so placed as to be set nearly perpendicular to the paper ; the end of the shank of ...
... plane , on which they are used . The ink and crayon points have a joint just un- der that part which fits into the compasses , by this they may be always so placed as to be set nearly perpendicular to the paper ; the end of the shank of ...
Page 80
... plane angles . The distance of the extre- mities of these rules are the subtenses or chords , or the arches they describe . Sectors are made of different sizes , but their length is usually denominated from the length of the legs when ...
... plane angles . The distance of the extre- mities of these rules are the subtenses or chords , or the arches they describe . Sectors are made of different sizes , but their length is usually denominated from the length of the legs when ...
Page 89
... plane may be more accurate- ly divided than by the former ; for any one of the larger divisions may by this be subdivided into 100 equal parts ; and , therefore , if the scale contains 10 of the larger divisions , any number under 1000 ...
... plane may be more accurate- ly divided than by the former ; for any one of the larger divisions may by this be subdivided into 100 equal parts ; and , therefore , if the scale contains 10 of the larger divisions , any number under 1000 ...
Page 99
... one another ; 3. the angles formed by the planes , in which these lines are drawn , or are supposed to be traced . On the comparison of these three objects , 9877454 depends the solution of all questions , that can be TRIGONOMETRY . 99.
... one another ; 3. the angles formed by the planes , in which these lines are drawn , or are supposed to be traced . On the comparison of these three objects , 9877454 depends the solution of all questions , that can be TRIGONOMETRY . 99.
Page 100
... planes . But the only object here is to explain the solutions of the former question : viz . PLANE TRIGONOMETRY . Plane Trigonometry is that branch of geometry , which teaches how to determine , or calculate three of the six parts of a ...
... planes . But the only object here is to explain the solutions of the former question : viz . PLANE TRIGONOMETRY . Plane Trigonometry is that branch of geometry , which teaches how to determine , or calculate three of the six parts of a ...
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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.