THE PLANE-TABLE AND ITS USE IN TOPOGRAPHICAL SURVEYING1869 |
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Página 5
... axis of 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 ...
... axis of 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 ...
Página 6
... axis of the cylindrical head of the leg , and projecting through a hole in the block , is fastened above by a female screw with a large milled head . A pair of compass sights or a watch telescope has some- times been attached to the ...
... axis of the cylindrical head of the leg , and projecting through a hole in the block , is fastened above by a female screw with a large milled head . A pair of compass sights or a watch telescope has some- times been attached to the ...
Página 7
... axis of the vertical movement of the telescope , and is secured at the extremity by a screw which holds it in its place . The telescope itself has the usual cross - hairs and means of focal adjustment . A transverse level is fastened to ...
... axis of the vertical movement of the telescope , and is secured at the extremity by a screw which holds it in its place . The telescope itself has the usual cross - hairs and means of focal adjustment . A transverse level is fastened to ...
Página 8
... axis which is supported at either end upon a cross- piece of brass , upheld by two square columns , having their bases upon a square plate forming the top of the standard , the support and standard being firmly united . This arrangement ...
... axis which is supported at either end upon a cross- piece of brass , upheld by two square columns , having their bases upon a square plate forming the top of the standard , the support and standard being firmly united . This arrangement ...
Página 10
... axis ; or , 2d , the axis is not horizontal , and consequently not paral- lel to the plane of the rule . In the first case the motion of the cross - hairs will be in a curve , and , upon being made . to cover the vertical line when the ...
... axis ; or , 2d , the axis is not horizontal , and consequently not paral- lel to the plane of the rule . In the first case the motion of the cross - hairs will be in a curve , and , upon being made . to cover the vertical line when the ...
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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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