A Rudimentary Treatise on Land and Engineering Surveying, with all the modern improvements ... With illustrationsVirtue brothers & Company, 1865 - 232 pages |
From inside the book
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Page 12
... turning the screw backwards the steel point may be gradually allowed to be pulled backwarks by the spring , and may again be gradually pulled forwards by the screw being turned for- wards . Fig . 1 Fig . 2 . Fig . 3 . Fig . 1 ...
... turning the screw backwards the steel point may be gradually allowed to be pulled backwarks by the spring , and may again be gradually pulled forwards by the screw being turned for- wards . Fig . 1 Fig . 2 . Fig . 3 . Fig . 1 ...
Page 65
... turning the screw F , till the points exactly measure that on the detached scale ; then , by loosening the little screws which hold the vernier b in its place , the posi- tion of the vernier may be gradually changed , till its zero coin ...
... turning the screw F , till the points exactly measure that on the detached scale ; then , by loosening the little screws which hold the vernier b in its place , the posi- tion of the vernier may be gradually changed , till its zero coin ...
Page 70
... turning the instrument round , as continu- ations of the thread , which is seen distinctly through the part of the slit that projects beyond the prism . The method of using the instrument is as follows : -the sight - vane S , and the ...
... turning the instrument round , as continu- ations of the thread , which is seen distinctly through the part of the slit that projects beyond the prism . The method of using the instrument is as follows : -the sight - vane S , and the ...
Page 73
... turning it gently till both readings are alike , each being made equal to half the sum of the two readings first obtained . When this adjustment is perfected , if the zeros of the vernier and limb are also made exactly to coincide , the ...
... turning it gently till both readings are alike , each being made equal to half the sum of the two readings first obtained . When this adjustment is perfected , if the zeros of the vernier and limb are also made exactly to coincide , the ...
Page 77
... turning the parallel plate screws , over which it is placed , and half - way by turning the tangent screw i . Repeat this operation till the bubble remains accurately in the centre of its run , in both positions of the telescope ; and ...
... turning the parallel plate screws , over which it is placed , and half - way by turning the tangent screw i . Repeat this operation till the bubble remains accurately in the centre of its run , in both positions of the telescope ; and ...
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Common terms and phrases
ABCD accuracy acres adjustment arches axis beam compasses breadth bubble centre chains common correct cross sections cubic yards cutting datum line depth direction distance divided draw embankments equal error EXAMPLE feet field book figure finding the contents fore sights formation level formula Gentleman's Diary given gradient ground height horizontal inches instrument intersection laid Lay the ruler length level book main line mark measured mile move it parallel NOTE object offsets parallax parallel ruler perpendicular position Prob protractor quality lines quantity of land radii radius railway curves Rankine's method ratio right angles river river Ouse road scale screw serpentine curve shewn shews side sine slopes spirit level square links staff stations straight fence surface survey surveyors taken taking tangent telescope theodolite tion Tithe Commissioners trapezium triangle tube tunnel vernier vernier scale vertical viaduct whence
Popular passages
Page 3 - 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 123 - An Act for consolidating in one Act certain provisions usually inserted in Acts of inclosure, and for facilitating the mode of proving the several facts usually required on the passing of such Acts...
Page 240 - Gd. 108*. METROPOLIS LOCAL MANAGEMENT AMENDMENT ACT, 1862 ; with Notes and Index. Is. 109. NUISANCES REMOVAL AND DISEASE PREVENTION ACT. Is. 110. RECENT LEGISLATIVE ACTS applying to Contractors, Merchants, and Tradesmen. Is.
Page 8 - Similar triangles are to one another in the duplicate ratio of their homologous sides.