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" The first adjustment is that of the line of collimation ; that is, to make the intersection of the cross wires coincide with the axis of the cylindrical rings on which the telescope turns : it is known to be correct, when... "
A Treatise on the Principal Mathematical Instruments Employed in Surveying ... - Page 22
by Frederick Walter Simms - 1834 - 100 pages
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Geometrical and Graphical Essays: Containing a General Description of the ...

George Adams - 1813 - 576 pages
...unnecessary. It is evident from the nature of this instrument that three adjustments are necessary. 1. To place the intersection of the wires in the telescope,...the cylindrical rings on which the telescope turns. 2. To render the level parallel to this axis. 3. To adjust for the horizontal motion quite round upon...
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A complete treatise on practical land-surveying

Thomas Holliday - 1838 - 404 pages
...instrument is properly adjusted, the intersection of the cross wires in the telescope will coincide exactly with the axis of the cylindrical rings on which the telescope turns, and the level will be parallel to this axis, also the telescope will be perpendicular to the vertical...
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An Essay on the Use of the Spirit Level: As Applied to Engineering and Other ...

Thomas Oswald Blackett - 1838 - 136 pages
...collimation that shall exactly coincide with the axis of the tube of the telescope; but more particularly with the axis of the cylindrical rings on which the telescope turns. Second—To make the column of air or bubble parallel to the line of collimation, or the axis of the...
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Trigonometrical Surveying, Levelling, and Railway Engineering

William Galbraith - 1842 - 216 pages
...inferior instrument. Adjustments. 1. The first adjustment is to make the intersection of the cross-wires coincide with the axis of the cylindrical rings on which the telescope turns, called rectifying the line of collimation. This is known to be correct when the eye, looking through...
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A Treatise on Military Surveying: Including Sketching in the Field, Plan ...

Basil Jackson - 1847 - 410 pages
...making it a rough circumferenter. The whole is mounted on parallel plates, and three legs, the same as a theodolite. It is evident, from the nature of this...quite round upon the staves. TO ADJUST THE LINE OF COI.LIMATION. The eye-piece being drawn out to see the wires distinctly, direct the telescope to any...
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Pike's Illustrated Descriptive Catalogue of Optical, Mathematical, and ...

Benjamin Pike - 1848 - 356 pages
...adjustment is that of the line of collimation ; that is, to make the intersection of the cross wires coincide with the axis of the cylindrical rings on which the telescope turns : it is known to be correct, when an eye looking through a telescope observes their intersection continue...
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Pike's Illustrated Descriptive Catalogue of Optical, Mathematical and ...

Benjamin Pike (Jr.) - 1848 - 482 pages
...adjustment is that of the line of collimation ; that is, to make the intersection of the cross wires coincide with the axis of the cylindrical rings on which the telescope turns : it is known to be correct, when an eye looking through a telescope observes their intersection continue...
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A treatise on land surveying [ed.] by W. Galbraith

John Ainslie - 1849 - 586 pages
...inferior instrument. ADJUSTMENTS. 1. The first adjustment is to make the intersection of the crosswires coincide with the axis of the cylindrical rings on which the telescope turns, called rectifying the line of collimation. This is known to be correct when the eye, looking through...
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A Manual of Surveying for India, Detailing the Mode of Operations on the ...

Sir Henry Edward Landor Thuillier - 1851 - 826 pages
...adjustment is that of the line of collimation; that is, to make the intersection of the cross wires coincide with the axis of the cylindrical rings on which the telescope turns : it is known to be correct, when an eye, looking through the telescope, observes their intersection...
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Surveyor's and Engineer's Companion: a Comcise Treatise on Mathematical ...

William Schmolz - 1859 - 196 pages
...ditch work. Three adjustments arc by leveling instruments necessary: First— place the intersections of the wires in the telescope, so that it shall coincide...the cylindrical rings on which the telescope turns. Second — to ren evol parallel to Third— set th cope perpendicula vertical axis, that the level...
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