The Theory and Practice of Surveying: Containing All the Instructions Requisite for the Skilful Practice of this Art |
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Page 153
... column of your field - book in a line with station No. 1 , and expresses the number of degrees the stationary line is from the north , counting quite round with the sun . Most needles are pointed at the south end , and have a small ring ...
... column of your field - book in a line with station No. 1 , and expresses the number of degrees the stationary line is from the north , counting quite round with the sun . Most needles are pointed at the south end , and have a small ring ...
Page 154
... column of your field - book , under the title of distances , opposite to station No. 1 . It is customary , and even ... column opposite to station No. 2 ; then measure the stationary distance BC , which insert in the third column , and ...
... column of your field - book , under the title of distances , opposite to station No. 1 . It is customary , and even ... column opposite to station No. 2 ; then measure the stationary distance BC , which insert in the third column , and ...
Page 155
... column ; and thus proceed from station to station , leaving your ob- ject in the last point you left , till you return to the first station A. * By this method your stations are laid out to the best advantage , and two men may do the ...
... column ; and thus proceed from station to station , leaving your ob- ject in the last point you left , till you return to the first station A. * By this method your stations are laid out to the best advantage , and two men may do the ...
Page 222
... columns ; the first of which is for the number of the triangle , the second for the base of it , the third for the perpendicular , and the fourth for the content in perches . Then proceed to measure the base of number 1 , 222 To find ...
... columns ; the first of which is for the number of the triangle , the second for the base of it , the third for the perpendicular , and the fourth for the content in perches . Then proceed to measure the base of number 1 , 222 To find ...
Page 223
... column of the table , under the word base ; and from the angle opposite to the base , open your compasses so , as when one foot is in the angular point , the other being moved backwards and forwards , may just touch the base line , and ...
... column of the table , under the word base ; and from the angle opposite to the base , open your compasses so , as when one foot is in the angular point , the other being moved backwards and forwards , may just touch the base line , and ...
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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.