The Theory and Practice of Surveying: Containing All the Instructions Requisite for the Skilful Practice of this ArtE. Duyckinck, 1811 - 508 pages |
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... Circumferentor 152 The Theodolite 159 3. To find the Latitude by the 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 ...
... Circumferentor 152 The Theodolite 159 3. To find the Latitude by the 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 ...
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... Circumferentor 152 The Theodolite 2. Description of Instru- 3. To find the Latitude by the 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 ...
... Circumferentor 152 The Theodolite 2. Description of Instru- 3. To find the Latitude by the 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 ...
Page 151
... the chain over to D , so as to complete a parallelogram ; by reckoning off the same number of links you had in BC , from E to D , and pulling each part straight . 1 THE CIRCUMFERENTOR . THIS instrument is composed of a OF THE CHAIN . 151.
... the chain over to D , so as to complete a parallelogram ; by reckoning off the same number of links you had in BC , from E to D , and pulling each part straight . 1 THE CIRCUMFERENTOR . THIS instrument is composed of a OF THE CHAIN . 151.
Page 152
... CIRCUMFERENTOR . THIS instrument is composed of a brass circu- lar box , about five or six inches in diameter ; within which is a brass ring , divided on the top into 360 degrees , and numbered 10 , 20 ... Circumferentor The Circumferentor.
... CIRCUMFERENTOR . THIS instrument is composed of a brass circu- lar box , about five or six inches in diameter ; within which is a brass ring , divided on the top into 360 degrees , and numbered 10 , 20 ... Circumferentor The Circumferentor.
Page 153
... north , counting quite round with the sun . Most needles are pointed at the south end , and have a small ring at the north : such needles are X better than those which are pointed at each end , THE CIRCUMFERENTOR . 158.
... north , counting quite round with the sun . Most needles are pointed at the south end , and have a small ring at the north : such needles are X better than those which are pointed at each end , THE CIRCUMFERENTOR . 158.
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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.