THE PLANE-TABLE AND ITS USE IN TOPOGRAPHICAL SURVEYING1869 |
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Página 4
... centre of the table . By means of these screws the board can be removed at will . The arms rest upon the sloping upper face of a conical plate of brass , to which they are permanently fixed . Upon its lower edge or peri- phery this cone ...
... centre of the table . By means of these screws the board can be removed at will . The arms rest upon the sloping upper face of a conical plate of brass , to which they are permanently fixed . Upon its lower edge or peri- phery this cone ...
Página 5
... centre , which is the centre also of the instrument , and the two are held together by means of a solid conical axis of brass extending upwards from the centre of the inner face of the lower disk . A socket of similar shape fits exactly ...
... centre , which is the centre also of the instrument , and the two are held together by means of a solid conical axis of brass extending upwards from the centre of the inner face of the lower disk . A socket of similar shape fits exactly ...
Página 6
Upon the under side and centre of the lower metal disk is a socket containing a ball with a 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 ...
Upon the under side and centre of the lower metal disk is a socket containing a ball with a 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 ...
Página 8
... centre of gravity over and coincident with that of the standard , instead of outside of it , as heretofore . The vertical arc is better protected by being placed in- side of the two square uprights , and the tangent screw made more ...
... centre of gravity over and coincident with that of the standard , instead of outside of it , as heretofore . The vertical arc is better protected by being placed in- side of the two square uprights , and the tangent screw made more ...
Página 9
... centre by means of the levelling screws of the table ; draw lines along the edge and ends of the rule upon the board to show its exact position , then reverse 180 ° . If the bubble remain central , it is in adjustment ; if not , correct ...
... centre by means of the levelling screws of the table ; draw lines along the edge and ends of the rule upon the board to show its exact position , then reverse 180 ° . If the bubble remain central , it is in adjustment ; if not , correct ...
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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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