THE PLANE-TABLE AND ITS USE IN TOPOGRAPHICAL SURVEYING1869 |
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Página 4
... brass arms , to which it is fastened by screws passing through them and entering the under side of the board , the three holes for the reception of the screws being guarded by brass bushings let into the wood , and situated equidistant ...
... brass arms , to which it is fastened by screws passing through them and entering the under side of the board , the three holes for the reception of the screws being guarded by brass bushings let into the wood , and situated equidistant ...
Página 5
... brass extending upwards from the centre of the inner face of the lower disk . A socket of similar shape fits exactly over this axis , projecting downward from the inner side of the apex of the conical or upper disk . The two plates are ...
... brass extending upwards from the centre of the inner face of the lower disk . A socket of similar shape fits exactly over this axis , projecting downward from the inner side of the apex of the conical or upper disk . The two plates are ...
Página 6
... brass arm , which pro- jects through the centre of the block from beneath . The lower end of the arm is threaded , and upon it plays a female screw with a large milled head , which can be re- laxed or tightened at pleasure . This screw ...
... brass arm , which pro- jects through the centre of the block from beneath . The lower end of the arm is threaded , and upon it plays a female screw with a large milled head , which can be re- laxed or tightened at pleasure . This screw ...
Página 7
... brass rule about twenty - two inches long , having a circular level on its upper face . Near the middle of the rule is a perpendicular cylindrical column of brass , called the " standard , " surmounted by two square brass plates joined ...
... brass rule about twenty - two inches long , having a circular level on its upper face . Near the middle of the rule is a perpendicular cylindrical column of brass , called the " standard , " surmounted by two square brass plates joined ...
Página 8
... brass or German silver ; a set of metal clamps for fastening the map to the table ; a pair of sharp dividers ; India - rubber , pencils , and a penknife , complete the list of essentials for prosecuting plane - table work . Since ...
... brass or German silver ; a set of metal clamps for fastening the map to the table ; a pair of sharp dividers ; India - rubber , pencils , and a penknife , complete the list of essentials for prosecuting plane - table work . Since ...
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25 cents 50 cents accuracy adjustment alidade axis brass BRIDGES centre chain circle clamp Cloth Coast Survey construction contours correct cross-hairs curves declinatoire depression determined diagram direction distance Edition Engineers engravings Feet fiducial edge field forward line forward signal GEOLOGY OF PENNSYLVANIA Graphical Statics ground HAND-BOOK height hills horizontal Hypsometry instrument intersection line of sight lines drawn lithographic plates marked means measured meridian metal method metres middle point minutes of arc Morocco necessary objects observed Paper covers parallel pencils perpendicular placed plane plane-table plotted points point occupied point sought falls PRACTICAL TREATISE Prof projection QUALITATIVE CHEMICAL ANALYSIS resection right angles rule scale sheet shore line side sketching Slide Valve slope station Steam Steel straight edge surveyor taken tangent screw telemeter telescope tion topographer triangle of error triangulation points true point U. S. Navy vertical arc wood-cuts Yale College ZERAH COLburn
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