THE PLANE-TABLE AND ITS USE IN TOPOGRAPHICAL SURVEYING1869 |
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Página 18
... becomes necessary to base topographical work upon a detached scheme of triangulation before the usual astronomical observations have been made . In this case the only elements given are the distances from the points to two projected ...
... becomes necessary to base topographical work upon a detached scheme of triangulation before the usual astronomical observations have been made . In this case the only elements given are the distances from the points to two projected ...
Página 20
arm by being freed for a while from its weight ; but one soon becomes so inured to it as to feel but little incon- venience , and carelessness in taking out and replacing it in the box so many times during the day is quite as likely to ...
arm by being freed for a while from its weight ; but one soon becomes so inured to it as to feel but little incon- venience , and carelessness in taking out and replacing it in the box so many times during the day is quite as likely to ...
Página 33
... becomes variable , and consequently erroneous . When , as we have seen , a triangulation point is occu- pied , and lines drawn from a number of other plotted points , with the table in position , intersect perfectly at that point , the ...
... becomes variable , and consequently erroneous . When , as we have seen , a triangulation point is occu- pied , and lines drawn from a number of other plotted points , with the table in position , intersect perfectly at that point , the ...
Página 34
... become sure , and another series of whose inaccuracy you are equally satisfied , renders the preference of one set over the other at times not only permissible but obligatory . It should always be remembered that absolute and careful ...
... become sure , and another series of whose inaccuracy you are equally satisfied , renders the preference of one set over the other at times not only permissible but obligatory . It should always be remembered that absolute and careful ...
Página 49
... become possessed of some knowledge of the country which is to be surveyed . A rapid examination of the ground , by showing whether it lies in regular parallel ridges and 4 intervening valleys , isolated hills , gradually sloping plains ...
... become possessed of some knowledge of the country which is to be surveyed . A rapid examination of the ground , by showing whether it lies in regular parallel ridges and 4 intervening valleys , isolated hills , gradually sloping plains ...
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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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