The Plane-table and Its Use in Topographical SurveyingD. Van Nostrand, 1869 - 79 páginas |
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Página 7
... vertical plane with the fiducial edge of the rule , though this is not absolutely necessary . Its position with regard to the edge , and its relation to it , should , however , be constant . A vertical arc with a tangent screw and clamp ...
... vertical plane with the fiducial edge of the rule , though this is not absolutely necessary . Its position with regard to the edge , and its relation to it , should , however , be constant . A vertical arc with a tangent screw and clamp ...
Página 8
... vertical arc is better protected by being placed in- side of the two square uprights , and the tangent screw made more stable by being made to play through one of the uprights on the opposite side from the arc . An arrangement for ...
... vertical arc is better protected by being placed in- side of the two square uprights , and the tangent screw made more stable by being made to play through one of the uprights on the opposite side from the arc . An arrangement for ...
Página 12
... Vertical Arc . - When the line of sight . is horizontal , the vernier of the vertical arc should read 0 ° , or the index error should be known . This may be ex- amined by means of the distant sea horizon , or by setting up the alidade ...
... Vertical Arc . - When the line of sight . is horizontal , the vernier of the vertical arc should read 0 ° , or the index error should be known . This may be ex- amined by means of the distant sea horizon , or by setting up the alidade ...
Página 54
... vertical arc cannot be relied upon for close determination of heights , and it is evident that the nearer to a level a country is , the nearer it is ne- cessary to obtain the exact elevation for the location of the contours , recourse ...
... vertical arc cannot be relied upon for close determination of heights , and it is evident that the nearer to a level a country is , the nearer it is ne- cessary to obtain the exact elevation for the location of the contours , recourse ...
Página 55
... vertical arc or level . Under certain conditions , as those of densely wooded heights and vales , inaccessible , precipitous ledges and bluffs , etc. , the operations of the surveyor are TOPOGRAPHICAL SURVEYING . 55.
... vertical arc or level . Under certain conditions , as those of densely wooded heights and vales , inaccessible , precipitous ledges and bluffs , etc. , the operations of the surveyor are TOPOGRAPHICAL SURVEYING . 55.
Otras ediciones - Ver todas
The Plane-table and Its Use in Topographical Surveying Alexander Medina Harrison Vista completa - 1884 |
A Treatise on the Plane-Table and its use in Topographical Surveying: (From ... Vista completa - 1870 |
Términos y frases comunes
accuracy adjustment alidade axis brass Brevet Bridge centre chain Chemistry circle clamp Cloth Coast Survey construction contours correct cross-hairs declinatoire depression detail determined diagrams direction distance draw edition elevation engravings experiments Feet fiducial edge field formula forward line ground heights hills horizontal Hypsometry Illustrated instrument intersection Iron J. P. WHITNEY line of sight lines drawn lithographic plates manufacture marked measured ment meridian Merrimack River method metres metric system middle point Mines objects observed paper parallel pencils perpendicular placed plane Plane Table plane-table plotted points point occupied position PRACTICAL TREATISE Prof projection Railway resection revised and enlarged rule scale sheet side sketching slope station Steam Engine steel straight edge Students Submarine surveyor taken tangent screw Telegraph telemeter telescope tion TOPOGRAPHICAL SURVEYING triangle of error triangulation points true point Trusses U. S. Army U. S. Navy vertical arc wood-cuts ZERAH COLBURN