Elements of Surveying with a Description of the Instruments and the Necessary Tables Including a Table of Natural Sines |
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Page 27
... turn- ing round a joint at their common extremity . There are several scales laid down on the sector : those , however , which are chiefly used in drawing lines and angles , are , the scale of chords already described , and the scale of ...
... turn- ing round a joint at their common extremity . There are several scales laid down on the sector : those , however , which are chiefly used in drawing lines and angles , are , the scale of chords already described , and the scale of ...
Page 56
... vernier plate , at right angles to each other , by small adjusting screws ; one of them with the inner spindle . It is made fast to is seen in the figure . The vernier plate turns freely around 56 ELEMENTS OF SURVEYING .
... vernier plate , at right angles to each other , by small adjusting screws ; one of them with the inner spindle . It is made fast to is seen in the figure . The vernier plate turns freely around 56 ELEMENTS OF SURVEYING .
Page 57
... turning on hinges , pass over the telescope , and are made fast by the pins c and d ; these loops confine the telescope in the Y's . By withdrawing the pins , and turning the loops on their hinges , the telescope may be removed for the ...
... turning on hinges , pass over the telescope , and are made fast by the pins c and d ; these loops confine the telescope in the Y's . By withdrawing the pins , and turning the loops on their hinges , the telescope may be removed for the ...
Page 59
... Turn the vernier plate , till the telescope comes directly over two of the levelling screws , between the plates DE and FG . Turn these screws contrary ways , keeping them firm against the plate FG , till the bubble of the level mn ...
... Turn the vernier plate , till the telescope comes directly over two of the levelling screws , between the plates DE and FG . Turn these screws contrary ways , keeping them firm against the plate FG , till the bubble of the level mn ...
Page 60
... Turn the vernier plate , until the upper telescope comes directly over two of the level- ling screws , then turn them contrary ways , till the upper tel- escope is horizontal ; after which , turn the vernier plate 180o , and if the ...
... Turn the vernier plate , until the upper telescope comes directly over two of the level- ling screws , then turn them contrary ways , till the upper tel- escope is horizontal ; after which , turn the vernier plate 180o , and if the ...
Common terms and phrases
acres adjusted angle of elevation axis azimuth back-sights base line called centre clamp-screw coincide column comp compass Cosine D Cosine Sine Cotang course curve decimal degrees determined difference of level direction divided double meridian distance draw east elongation error example feet field notes figure given angle given line given point ground Gunter's chain half hence horizontal angle horizontal distance horizontal plane hypothenuse inches instrument intersection latitude and departure length levelling screws line AC line of collimation logarithm M.
M. Sine marked measure method multiplied natural sines needle object paper parallel passing perpendicular piece of land pins plane of reference protractor radius right angles right-angled triangle rods scale of equal secant side similar triangles spider's lines square chains staff subtract surface survey Tang tangent theodolite true meridian vernier plate vertical limb yards