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" ... corresponds with the horizontal wire of the telescope, the height of the wire in the vane, noted on the staff, is the height of the apparent level above the ground at that place. When both the staves are used, they should be set up at equal distances... "
Pike's Illustrated Descriptive Catalogue of Optical, Mathematical, and ... - Page 96
by Benjamin Pike - 1848
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Geometrical and Graphical Essays: Containing a General Description of the ...

George Adams - 1813 - 576 pages
...hole made in the vane ; when this wire coincides with the horizontal wire of the telescope, it shews the height of the apparent level above the ground at that place. OF LEVELLING. Levelling is the art which instructs us in fmding how much higher or lower any given...
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A Treatise on the Principal Mathematical Instruments Employed in Surveying ...

Frederick Walter Simms - 1834 - 124 pages
...shown in the annexed figure : this vane being raised or lowered by the assistant, until the cross wire corresponds .with the horizontal wire of the telescope,...be set up at equal .distances on each side of the spirit-level : the difference of the heights of their vanes •will be the absolute difference of level...
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A Treatise on the Principal Mathematical Instruments Employed in Surveying ...

Frederick Walter Simms - 1834 - 134 pages
...shown in the annexed figure : this vane being raised or lowered by the assistant, until the cross wire corresponds with the horizontal wire of the telescope,...the apparent level above the ground at that place. 1 When both the staves are used, they should be set up at equal distances on each side of the spirit-level...
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A Treatise on the Principal Mathematical Instruments Employed in Surveying ...

Frederick Walter Simms - 1836 - 160 pages
...GRAVATT'S construction, will scarcely ever need being repeated. OF THE LEVELLING STAVES. LEVELLING-STAVES. the telescope, the height of the wire in the vane,...should be set up at equal distances on each side of the spirit-level : the difference of the heights of their vanes will be the absolute difference of level...
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A Treatise on the Principal Mathematical Instruments Employed in Surveying ...

Frederick Walter Simms - 1844 - 178 pages
...sliding vane, with a wire placed across a square hole in the centre, as shown in the annexed figure : this vane being raised or lowered by the assistant,...should be set up at equal distances on each side of the spiritlevel : the difference of the heights of their vanes will be the absolute difference of level...
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A Treatise on Military Surveying: Including Sketching in the Field, Plan ...

Basil Jackson - 1847 - 410 pages
...shown in the annexed figure; the vane being raised or lowered by the assistant until the cross wire corresponds with the horizontal wire of the telescope,...the apparent level above the ground at that place. rv When both the staves are used they should be set up at equal distances on each side of the spirit-level...
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A Treatise on the Principal Mathematical Instruments Employed in Surveying ...

Frederick Walter Simms - 1850 - 184 pages
...sliding vane, with a wire placed across a square hole in the centre, as shewn in the annexed figure : this vane being raised or lowered by the assistant,...the apparent level above the ground at that place. j=, 1 When both the staves are used, they should be MJ set up at equal distances on each side of the...
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A Treatise on Military Surveying: Including Sketching in the Field, Plan ...

Basil Jackson - 1853 - 420 pages
...shown in the annexed figure; the vane being raised or lowered by the assistant until the cross wire corresponds with the horizontal wire of the telescope,...should be set up at equal distances on each side of the spirit-level ; the difference of the heights of their vanes will be the absolute difference of level...
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Light and Lens: Photography in the Digital Age

Robert Hirsch - 2008 - 416 pages
...pictures outside, on a clear day, in direct 282 ' ' i, I ' / f f - - r 9.8 When copying work, two lights should be set up at equal distances on each side of the camera at 45-degree angles to the work being copied. Meter from a gray card, not off the surface of...
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