The Theory and Practice of Surveying: Containing All the Instructions Requisite for the Skilful Practice of this ArtE. Duyckinck, 1811 - 508 σελίδες |
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Σελίδα 152
... sights , which are screwed to the index , and stand perpendicular thereto in each sight is a large and a small aper- ture , or slit , one over the other ; but these are changed , that is if the large aperture be uppermost in the one sight ...
... sights , which are screwed to the index , and stand perpendicular thereto in each sight is a large and a small aper- ture , or slit , one over the other ; but these are changed , that is if the large aperture be uppermost in the one sight ...
Σελίδα 153
... sight : the degrees then cut by the south end of the needle , will give the number to be placed in the second column of your field - book in a line with station No. 1 , and expresses the number of degrees the stationary line is from the ...
... sight : the degrees then cut by the south end of the needle , will give the number to be placed in the second column of your field - book in a line with station No. 1 , and expresses the number of degrees the stationary line is from the ...
Σελίδα 154
... sights , directed to the object at C , and the north of the box next your eye , count your degrees to the south end of the needle , which register in your field - book , in the second column opposite to station No. 2 ; then measure the ...
... sights , directed to the object at C , and the north of the box next your eye , count your degrees to the south end of the needle , which register in your field - book , in the second column opposite to station No. 2 ; then measure the ...
Σελίδα 155
... sights . * But the generality of mearsmen frequently set themselves in disadvantageous places , so as often to occasion two or more stations to be made , where one may do , which creates much trouble and loss of time ; we will therefore ...
... sights . * But the generality of mearsmen frequently set themselves in disadvantageous places , so as often to occasion two or more stations to be made , where one may do , which creates much trouble and loss of time ; we will therefore ...
Σελίδα 156
... sights , because of overseeing the chain- ing ; for should he take back - sights , he must be obliged , after taking his degree , to go back to the foregoing station , to oversee the chaining , and by this means to walk three times over ...
... sights , because of overseeing the chain- ing ; for should he take back - sights , he must be obliged , after taking his degree , to go back to the foregoing station , to oversee the chaining , and by this means to walk three times over ...
Άλλες εκδόσεις - Προβολή όλων
Συχνά εμφανιζόμενοι όροι και φράσεις
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
Δημοφιλή αποσπάσματα
Σελίδα 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.
Σελίδα 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.
Σελίδα 197 - RULE. From half the sum of the three sides subtract each side severally.
Σελίδα 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.
Σελίδα 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.