THE PLANE-TABLE AND ITS USE IN TOPOGRAPHICAL SURVEYING1869 |
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Página 6
... telescope has some- times been attached to the under side of the board of the plane - table . When the table has been put " in position , " the watch telescope is directed to some well - defined object , and by after reference to it any ...
... telescope has some- times been attached to the under side of the board of the plane - table . When the table has been put " in position , " the watch telescope is directed to some well - defined object , and by after reference to it any ...
Página 7
... telescope . This cone forms the 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 ...
... telescope . This cone forms the 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 ...
Página 8
... telescope , instead of being supported on the side of the standard , is " transit mounted , " resting upon an axis which is supported at either end upon a cross- piece of brass , upheld by two square columns , having their bases upon a ...
... telescope , instead of being supported on the side of the standard , is " transit mounted , " resting upon an axis which is supported at either end upon a cross- piece of brass , upheld by two square columns , having their bases upon a ...
Página 10
... telescope to some distant , well - defined object . If the contact remain perfect when the position of the eye is changed in any way , there is no parallax ; but if it does not , then the focus of the object - glass must be changed ...
... telescope to some distant , well - defined object . If the contact remain perfect when the position of the eye is changed in any way , there is no parallax ; but if it does not , then the focus of the object - glass must be changed ...
Página 11
... telescope is horizontal , they will , upon being elevated and depressed , appear upon different sides of the vertical line . These two cases will be considered separately . When the construction of the telescope admits of it , the ...
... telescope is horizontal , they will , upon being elevated and depressed , appear upon different sides of the vertical line . These two cases will be considered separately . When the construction of the telescope admits of it , 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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