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" ... middle of the limb, then, holding the instrument horizontally with the divided limb from the observer, and the index-glass to the eye, look obliquely down the glass, so as to see the circular arc, by direct view and by reflection, in the glass at... "
Practical Geodesy: Comprising Chain Surveying, and the Use of Surveying ... - Page 268
by Sir J. Butler Williams - 1846 - 330 pages
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A Treatise on the Principal Mathematical Instruments Employed in Surveying ...

Frederick Walter Simms - Astronomical instruments - 1834 - 134 pages
...so as to see the circular arc, by direct view and by reflection, in the glass at the same time ; and if they appear as one continued arc of a circle, the...in the first instance set right by the maker, and firmly fixed in its place, its position is not liable to alter, therefore no direct means are supplied...
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A Treatise on the Principal Mathematical Instruments Employed in Surveying ...

Frederick Walter Simms - Astronomical instruments - 1844 - 190 pages
...so as to see the circular arc, by direct view and by reflection, in the glass at the same time ; and if they appear as one continued arc of a circle, the...reflected and direct parts of the limb meet. This in a well made instrument is seldom the case, unless the sextant has been exposed to rough treatment. As...
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A Treatise on Military Surveying: Including Sketching in the Field, Plan ...

Basil Jackson - Military reconnaissance - 1847 - 410 pages
...by direct view and by reflection, in the glass at the same time; and if they appear as one continued circle, the index-glass is in adjustment. If it requires...in the first instance, set right by the maker and firmly fixed in its place, and, its position not being liable to alter, no direct means are supplied...
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Pike's Illustrated Descriptive Catalogue of Optical, Mathematical and ...

Benjamin Pike (Jr.) - Scientific apparatus and instruments - 1848 - 482 pages
...so as to see the circular arc, by direct view and by reflection, in the glass at the same time ; and if they appear as one continued arc of a circle, the...in the first instance set right by the maker, and firmly fixed in its place, its position is not liable to alter, therefore no direct means are supplied...
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Pike's Illustrated Descriptive Catalogue of Optical, Mathematical, and ...

Benjamin Pike - Science - 1848 - 356 pages
...so as to see the circular arc, by direct view and by reflection, in the glass at the same time ; and if they appear as one continued arc of a circle, the...As the glass is in the first instance set right by tbe maker, and firmly fixed in its place, its position is not liable to alter, therefore no direct...
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A Treatise on the Principal Mathematical Instruments Employed in Surveying ...

Frederick Walter Simms - Astronomical instruments - 1850 - 184 pages
...and if they appear as one continued arc of a circle, the index-glass is in adjustment. If it require correcting, the arc will appear broken where the reflected...in the first instance set right by the maker, and firmly fixed in its place, its position is not liable to alter ; therefore no direct means are supplied...
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A Manual of Surveying for India, Detailing the Mode of Operations on the ...

Sir Henry Edward Landor Thuillier - Surveying - 1851 - 826 pages
...so as to see the circular arc, by direct view and by reflection, in the glass at the same time ; and if they appear as one continued arc of a circle, the...reflected and direct parts of the limb meet. This in a well made instrument is seldom the case, unless the sextant has been exposed to rough treatment. As...
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An Introduction to Practical Astronomy: With a Collection of Astronomical Tables

Elias Loomis - Spherical astronomy - 1855 - 508 pages
...at the same time ; and if they appear as one continued arc of a circle, the index-glass is adjusted. If it requires correcting, the arc will appear broken...where the reflected and direct parts of the limb meet. As the glass is, in the first instance, set right by the maker, and firmly fixed in its place, its...
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Navigation

James Pryde - Navigation - 1867 - 506 pages
...time ; and if they appear as one continued arc of a circle, the index-glass is adjusted. If the arc appear broken where the reflected and direct parts of the limb meet, it requires to be corrected. But as this glass is, in the first instance, set right by the maker, and...
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