A Rudimentary Treatise on Land and Engineering Surveying, with all the modern improvements ... With illustrationsVirtue brothers & Company, 1865 - 232 páginas |
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Página 64
... adjustment of the points G , H to any definite distance apart . This is accomplished by two verniers , or reading places b , c each fixed at the side of an opening in the brass boxes , to which they are attached , and affording the ...
... adjustment of the points G , H to any definite distance apart . This is accomplished by two verniers , or reading places b , c each fixed at the side of an opening in the brass boxes , to which they are attached , and affording the ...
Página 65
... adjustment of the vernier b , which like all other me- chanical adjustments , will occasionally become deranged . This verification must be performed by means of a detached scale . Suppose , for example , that the beam compass is ...
... adjustment of the vernier b , which like all other me- chanical adjustments , will occasionally become deranged . This verification must be performed by means of a detached scale . Suppose , for example , that the beam compass is ...
Página 72
... adjusting . When the Sextant is to be used , the lid E of the box , is taken off and screwed to the bottom , where it ... adjustment . — Place the dark glass before the eye - end of the telescope , and looking at the sun , and moving the ...
... adjusting . When the Sextant is to be used , the lid E of the box , is taken off and screwed to the bottom , where it ... adjustment . — Place the dark glass before the eye - end of the telescope , and looking at the sun , and moving the ...
Página 73
... adjustment ; but , if not , half the difference is the amount of error , which must be corrected by applying the key k to the screw at b , and turning it gently till both readings are alike , each being made equal to half the sum of the ...
... adjustment ; but , if not , half the difference is the amount of error , which must be corrected by applying the key k to the screw at b , and turning it gently till both readings are alike , each being made equal to half the sum of the ...
Página 76
... adjustments must be attended to : - 1. Adjustments of the telescope for parallax and collimation . 2. Adjustments of the horizontal limb for setting the levels on the horizontal limb to indicate the verticality of its axis . 3. Adjustment ...
... adjustments must be attended to : - 1. Adjustments of the telescope for parallax and collimation . 2. Adjustments of the horizontal limb for setting the levels on the horizontal limb to indicate the verticality of its axis . 3. Adjustment ...
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Otras ediciones - Ver todas
Elementary Treatise on Land Engineering Survey with All the Modern ... Thomas Baker Vista completa - 1859 |
Términos y frases comunes
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
Pasajes populares
Página 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.
Página 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...
Página 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.
Página 8 - Similar triangles are to one another in the duplicate ratio of their homologous sides.