Elements of Surveying with a Description of the Instruments and the Necessary Tables Including a Table of Natural Sines |
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Page 76
... sights mark some distinct object ; then look through the other sights and place a staff on the line which they indicate : let the cross be then turned until the sights of the bar AB come to the same line : if the other sights are ...
... sights mark some distinct object ; then look through the other sights and place a staff on the line which they indicate : let the cross be then turned until the sights of the bar AB come to the same line : if the other sights are ...
Page 78
... the known distance . From A , measure on the line AC , any convenient distance AB , and place a B C staff vertically at . B. Then placing the eye at A , sight to the object D , and let the point , at 78 ELEMENTS OF SURVEYING .
... the known distance . From A , measure on the line AC , any convenient distance AB , and place a B C staff vertically at . B. Then placing the eye at A , sight to the object D , and let the point , at 78 ELEMENTS OF SURVEYING .
Page 91
... sights , AF and BG , are placed at right angles to the plate AB , and fastened to it firmly by the screws a and b . In each sight there is a large and small aperture or slit ; the larger aperture being above the smaller in one of the sights ...
... sights , AF and BG , are placed at right angles to the plate AB , and fastened to it firmly by the screws a and b . In each sight there is a large and small aperture or slit ; the larger aperture being above the smaller in one of the sights ...
Page 92
... sights AF and BG . To effect this , a small arc HI is described on the bar AB , having its centre at the centre of the compass - box . This arc is divided to degrees , and sometimes to the parts of a degree . A vernier is also used ...
... sights AF and BG . To effect this , a small arc HI is described on the bar AB , having its centre at the centre of the compass - box . This arc is divided to degrees , and sometimes to the parts of a degree . A vernier is also used ...
Page 94
... sight , or reverse bearing . 128. The perpendicular distance between the east and west lines , drawn through the extremities of a course , is called the northing or southing , according as the course is run towards the north or south ...
... sight , or reverse bearing . 128. The perpendicular distance between the east and west lines , drawn through the extremities of a course , is called the northing or southing , according as the course is run towards the north or south ...
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