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The actual horiz distance Xa is then scaled from map , after the point has been plotted , and is multiplied by tangent of vert angle , to give difference in elevation between camera station and point a ; or it can be found graphically .
Vert angles can now be read directly . Horiz angles are corrected , or corrections may be avoided , in precisely the same manner as with an auxiliary telescope . Eccentric telescope . Several American manufacturers until recently made ...
Transfer the horis projection of A - D to a vert plane passing through both points by swinging arc A - A ' and projecting A ' downward to A " at elev of A. Inclination of A " -D , by protractor , is slope of connecting line A - D . If ...
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I only have the second volume of this work, and I love it! Found at a local Value Village, it is filled with fascinating information. Details of all aspects of mine engineering, including compressed air, ventilation, and supporting structures. Baca ulasan lengkap
Conditions Methods in General
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