THE PLANE-TABLE AND ITS USE IN TOPOGRAPHICAL SURVEYING1869 |
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Página 8
... topographer to draw a more extended line upon his sheet than the limits of the rule would permit ; but , as it is liable to the same objection as that instrument , it has not come into general use . A declinatoire , consisting of a ...
... topographer to draw a more extended line upon his sheet than the limits of the rule would permit ; but , as it is liable to the same objection as that instrument , it has not come into general use . A declinatoire , consisting of a ...
Página 13
... the main reliance of the surveyor . PAPER . In addition to faulty adjustment of his instru- ment the topographer has an additional source of error to guard against , arising from the expansion and contraction of TOPOGRAPHICAL SURVEYING .
... the main reliance of the surveyor . PAPER . In addition to faulty adjustment of his instru- ment the topographer has an additional source of error to guard against , arising from the expansion and contraction of TOPOGRAPHICAL SURVEYING .
Página 19
... topographer is at work he holds the shade to protect the chart from the glare of the sun . In some sections the labor of carrying the table is quite fatiguing , in which case another man should be employed with the shade . He should ...
... topographer is at work he holds the shade to protect the chart from the glare of the sun . In some sections the labor of carrying the table is quite fatiguing , in which case another man should be employed with the shade . He should ...
Página 21
... topographers , is to cover the whole sheet , as exposed on the table , with thin paper , tearing it away at those ... topographer must as- sure himself of the correctness of the plotted points on the sheet , by an examination of them ...
... topographers , is to cover the whole sheet , as exposed on the table , with thin paper , tearing it away at those ... topographer must as- sure himself of the correctness of the plotted points on the sheet , by an examination of them ...
Página 22
... topographer . Sometimes , from lack of natural objects , it is found ad- visable to go beforehand over the country and locate sig- nals in suitable points for subsequent determination and use . In the location of signals , either as ...
... topographer . Sometimes , from lack of natural objects , it is found ad- visable to go beforehand over the country and locate sig- nals in suitable points for subsequent determination and use . In the location of signals , either as ...
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Términos y frases comunes
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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