 | Frederick Walter Simms - 1834 - 134 pages
...view and by reflection, in the glass at the same time ; and if they appear as one continued arc of a circle, the index-glass is in adjustment. If it requires...right by the maker, and firmly fixed in its place, its position is not liable to alter, therefore no direct means are supplied for its adjustment. To... | |
 | Sir J. Butler Williams - 1846 - 368 pages
...direct view and by reflection, in the glass at the same time; if they appear as one continued arc of a circle, the indexglass is in adjustment. If it requires...in the first instance set right by the maker, and fixed in its place, its position is not liable to alter, therefore no direct means are suppued for... | |
 | Benjamin Pike (Jr.) - 1848 - 482 pages
...view and by reflection, in the glass at the same time ; and if they appear as one continued arc of a circle, the index-glass is in adjustment. If it requires...right by the maker, and firmly fixed in its place, its position is not liable to alter, therefore no direct means are supplied for its adjustment. To... | |
 | Benjamin Pike - 1848 - 356 pages
...view and by reflection, in the glass at the same time ; and if they appear as one continued arc of a circle, the index-glass is in adjustment. If it requires...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 - 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...right by the maker, and firmly fixed in its place, its position is not liable to alter ; therefore no direct means are supplied for its adjustment. To... | |
 | Sir Henry Edward Landor Thuillier - 1851 - 826 pages
...view and by reflection, in the glass at the same time ; and if they appear as one continued arc of a circle, the indexglass is in adjustment. If it requires...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 - 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 - 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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... 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 the same... 