Elements of Surveying with a Description of the Instruments and the Necessary Tables Including a Table of Natural Sines |
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Page 55
... screw the lower horizontal plate DE , and becomes firmly attached to the body of the instrument . Through the horizontal plate DE , four small hollow cylinders are inserted , which receive four screws with milled heads , that work ...
... screw the lower horizontal plate DE , and becomes firmly attached to the body of the instrument . Through the horizontal plate DE , four small hollow cylinders are inserted , which receive four screws with milled heads , that work ...
Page 56
C. Davies. of the plate DE , and screws firmly into the curved part of the second horizontal plate FG . A hollow ... screw enters the inner one , and presses a washer against the other , and the base of the ball . On the upper surface of ...
C. Davies. of the plate DE , and screws firmly into the curved part of the second horizontal plate FG . A hollow ... screw enters the inner one , and presses a washer against the other , and the base of the ball . On the upper surface of ...
Page 57
... screws , placed at the angular points of an equilateral triangle . The vertical semicircle UV , is called the vertical limb ; its motions are governed by the thumb - screw Z , which has a pinion , that works with the teeth of the ver ...
... screws , placed at the angular points of an equilateral triangle . The vertical semicircle UV , is called the vertical limb ; its motions are governed by the thumb - screw Z , which has a pinion , that works with the teeth of the ver ...
Page 58
... screws , one of which , f , is seen in the figure ; and the horizontal hair , by two vertical screws , g and h . Before using the theodolite , it must be properly adjusted . The adjustment consists in bringing the different parts to ...
... screws , one of which , f , is seen in the figure ; and the horizontal hair , by two vertical screws , g and h . Before using the theodolite , it must be properly adjusted . The adjustment consists in bringing the different parts to ...
Page 59
... 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 , stands at the middle of the tube . Then , open the loops , and reverse the telescope ...
... 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 , stands at the middle of the tube . Then , open the loops , and reverse the telescope ...
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