The Theory and Practice of Surveying: Containing All the Instructions Requisite for the Skilful Practice of this Art |
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... Meridian Al- titude of the Sun 316 4. Variation of the Com- pass S18 The Semicircle 164 Mensuration of An- LIST OF TABLES . gles by these In . struments 169 Logarithms of Numbers 1 The Protractor , 171 Sines , Tangents and Secants 20 2 ...
... Meridian Al- titude of the Sun 316 4. Variation of the Com- pass S18 The Semicircle 164 Mensuration of An- LIST OF TABLES . gles by these In . struments 169 Logarithms of Numbers 1 The Protractor , 171 Sines , Tangents and Secants 20 2 ...
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... Meridian Al- titude of the Sun 315 4. Variation of the Com- 305 159 pass 918 The Semicircle 164 Mensuration of An- LIST OF TABLES . gles by these In- struments 169 The Protractor , 171 2. Mensuration of Logarithms of Numbers Sines ...
... Meridian Al- titude of the Sun 315 4. Variation of the Com- 305 159 pass 918 The Semicircle 164 Mensuration of An- LIST OF TABLES . gles by these In- struments 169 The Protractor , 171 2. Mensuration of Logarithms of Numbers Sines ...
Page 159
... meridian line , or the proper situation of the land . Over the brass circle is a pair of sights , fixed to a moveable index , which turns on the centre of the instrument , and upon which the circumferentor box is placed . This ...
... meridian line , or the proper situation of the land . Over the brass circle is a pair of sights , fixed to a moveable index , which turns on the centre of the instrument , and upon which the circumferentor box is placed . This ...
Page 160
... are twice as many right ones as there are sides : but all the angles about the point H , are 160 THE THEODOLITE . The Theodolite To find the Latitude by the Meridian titude of the Sun 316 The Theodolite Description of Instru-
... are twice as many right ones as there are sides : but all the angles about the point H , are 160 THE THEODOLITE . The Theodolite To find the Latitude by the Meridian titude of the Sun 316 The Theodolite Description of Instru-
Page 163
... meridian ; and inasmuch as one pair is sufficient to find the angles of the field , the se- cond can be of no use : besides , they obstruct the free motion of the moveable index , and therefore are rather an incumbrance than of any real ...
... meridian ; and inasmuch as one pair is sufficient to find the angles of the field , the se- cond can be of no use : besides , they obstruct the free motion of the moveable index , and therefore are rather an incumbrance than of any real ...
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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.