 | Thomas Keith - Navigation - 1810 - 478 pages
...c«ntre. The correction is generally very small, and is only necessary where great accuracy is required. The observer may be considered in three different...observer, when produced, would pass without the objects. (D) FIRST, let the observer be at D, in a line between the objects B and c, viz. on one side of the... | |
 | George Adams - Geometry - 1813 - 576 pages
...observer may be considered in three different positions with respect to the centre and the objects; for he is either in a line with the centre and one of these objects, or in an intermediate one, that is, a line from this centre to the observer produced... | |
 | Thomas Keith - Navigation - 1826 - 504 pages
...centre. The correction is generally very small, and is only necessary where great accuracy is required. The observer may be considered in three different...observer, when produced, would pass without the objects. (D) FIRST, let the observer be at D, in a line between the objects в and c, viz. on one side of the... | |
 | Thomas Keith - 1839 - 498 pages
...centre. The correction is generally very small, and is only necessary where great accuracy is required. The observer may be considered in three different...observer, when produced, would pass without the objects. (175) FIRST, let the observer be at D, in a line between the objects B and c, viz. on one side of the... | |
 | Sir Henry Edward Landor Thuillier - Surveying - 1851 - 826 pages
...observer may be considered in three different positions with respect to the centre and the objects ; for he is either in a line with the centre, and one of these objects, or in an intermediate one, that is, a line from this centre to the observer produced,... | |
 | Anthony Nesbit - Measurement - 1859 - 482 pages
...centre. The correction is generally very small, and is only necessary where great accuracy is required. The observer may be considered in three different...observer, when produced, would pass without the objects. • Philosophical Transactions for 1797, p. 29, « stq. First. Let the observer be at D, in a line... | |
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... for points of observation, the instrument cannot be placed exactly at the centre of the signal, and consequently the angle observed will be different from that which would have been found at the centre. The correction is generally very small, and... 