| 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... | |
| 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... | |
| 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... | |
| 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... | |
| 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... | |
| 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... | |
| 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... | |
| 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... | |
| 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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