THE PLANE-TABLE AND ITS USE IN TOPOGRAPHICAL SURVEYING1869 |
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Página 7
... cross - hairs and means of focal adjustment . A transverse level is fastened to the edge of the upper of the two plates at the top of the standard by means of adjusting screws . The telescope is so placed that its line of collimation is ...
... cross - hairs and means of focal adjustment . A transverse level is fastened to the edge of the upper of the two plates at the top of the standard by means of adjusting screws . The telescope is so placed that its line of collimation is ...
Página 10
... cross - hairs are in the common focus of the object and eye - glasses . It may occur that the true focus of the cross - hairs is not obtained at first , in which case a readjustment is necessary , in order to see both them and the ...
... cross - hairs are in the common focus of the object and eye - glasses . It may occur that the true focus of the cross - hairs is not obtained at first , in which case a readjustment is necessary , in order to see both them and the ...
Página 11
... cross - hairs will be in a straight line oblique to the hori- zontal , and , when made to cover the vertical line when the telescope is horizontal , they will , upon being elevated and depressed , appear upon different sides of the ...
... cross - hairs will be in a straight line oblique to the hori- zontal , and , when made to cover the vertical line when the telescope is horizontal , they will , upon being elevated and depressed , appear upon different sides of the ...
Página 12
... cross - hairs bisect it , the adjustment is cor- rect ; but if they do not , it can be corrected by means of the screws attaching the standard to the rule . 6. Zero of the Vertical Arc . - When the line of sight . is horizontal , the ...
... cross - hairs bisect it , the adjustment is cor- rect ; but if they do not , it can be corrected by means of the screws attaching the standard to the rule . 6. Zero of the Vertical Arc . - When the line of sight . is horizontal , the ...
Página 13
... cross - hairs upon it , and adjust the vernier accordingly . A longitudinal riding level placed upon the telescope , or a level permanently fastened upon the top of the tele- scope parallel to the optical axis , and adjusted to the ...
... cross - hairs upon it , and adjust the vernier accordingly . A longitudinal riding level placed upon the telescope , or a level permanently fastened upon the top of the tele- scope parallel to the optical axis , and adjusted to the ...
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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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