Elements of Surveying: With a Description of the Instruments and the Necessary Tables, Including a Table of Natural Sines |
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Page 135
... clamp - screw , and mark with a pin the point of the paper directly over the station , which point is de- termined most accurately by suspending a plumb from the lower side of the table . Press the pin firmly on this point , bring the ...
... clamp - screw , and mark with a pin the point of the paper directly over the station , which point is de- termined most accurately by suspending a plumb from the lower side of the table . Press the pin firmly on this point , bring the ...
Page 140
... clamp - screw , which , being loosened , allows the upper part of the instrument to turn freely around its axis . Qisa tangent - screw , by means of which the upper part of the instrument is moved gently , after the clamp - screw S has ...
... clamp - screw , which , being loosened , allows the upper part of the instrument to turn freely around its axis . Qisa tangent - screw , by means of which the upper part of the instrument is moved gently , after the clamp - screw S has ...
Page 141
... clamp - screw S , and direct the telescope to a small , well - defined , and distant object . Then slide the eye - glass till the spider's lines are seen distinctly ; after which , with the screw X , adjust the object - glass to its ...
... clamp - screw S , and direct the telescope to a small , well - defined , and distant object . Then slide the eye - glass till the spider's lines are seen distinctly ; after which , with the screw X , adjust the object - glass to its ...
Page 142
... clamp - screw S , and turn the bar EE , until the level DC comes directly over two of the levelling screws . By means of these screws , make the level CD truly horizontal . Then , turn the level quite round ; if , during the revolution ...
... clamp - screw S , and turn the bar EE , until the level DC comes directly over two of the levelling screws . By means of these screws , make the level CD truly horizontal . Then , turn the level quite round ; if , during the revolution ...
Page 159
... clamp - screw the body of the instrument until the telescope comes nearly of the vernier plate . Loosen the lower clamp - screw , and turn OF SURVEYING HARBOURS . 159 CHAPTER VII Of Surveying Harbours, • To Fix the Principal Points,
... clamp - screw the body of the instrument until the telescope comes nearly of the vernier plate . Loosen the lower clamp - screw , and turn OF SURVEYING HARBOURS . 159 CHAPTER VII Of Surveying Harbours, • To Fix the Principal Points,
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Common terms and phrases
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 DegDeg Distance 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 LatDegDeg LatDegDegDegDeg Distance latitude and departure length levelling screws line AC line of collimation logarithm marked measure multiplied natural sines paper parallel passing perpendicular plane of reference protractor radius right angles rods scale of equal secant side sights similar triangles Sine D Sine Sine spider's lines square chains staff subtract surface survey Tang tangent theodolite true meridian vernier plate vertical limb yards