 The angle between the first and last directions of a ray which has suffered two reflections in one plane is equal to twice the inclination of the reflecting surfaces to each other. Let AB be the limb or graduated . arc, of a portion of a circle 60° in...  Text-book on Navigation and Nautical Astronomy - Page 28by James Gill - 1918 - 438 pagesFull view - About this book
 | Sir John Frederick William Herschel - Astronomy - 1833 - 444 pages
...The principle of this instrument is the optical property of reflected rays, thus announced : — " The angle between the first and last directions of a ray which has suffered two reflexions in one plane is equal to twice the inclination of the reflecting surfaces to each other."... | |
 | sir John Frederick W. Herschel (1st bart.) - 1833 - 500 pages
...The principle of this instrument is the optical property of reflected rays, thus announced : — " The angle between the first and last directions of a ray which has suffered two reflexions in one plane is equal to twice the inclination of the reflecting surfaces to each other."... | |
 | John Frederick William Herschel - Astronomy - 1842 - 472 pages
...and probably was, independent of any knowledge of New!>.m's, though Mutton insinuates the contrary. angle between the first and last directions of a ray...suffered two reflections in one plane is equal to twice -c the inclination of the reflecting surfaces to each other." Let AB be the limb, or graduated arc,... | |
 | John Frederick William Herschel - Astronomy - 1849 - 672 pages
...The principle of this instrument is the optical property of reflected rays, thus announced:—"The angle between the first and last directions of a ray...twice the inclination of the reflecting surfaces to each other." Let AB be the limb, or graduated arc, of a portion of a circle 60° in extent, but divided... | |
 | Anna Cabot Lowell - Astronomy - 1850 - 412 pages
...could be taken at sea. The principle of this instrument is that property of reflected rays by which the angle between the first and last directions of...inclination of the reflecting surfaces to one another. The instrument is called a sextant if one sixth part of a graduated circle is used, a quadrant if one... | |
 | John Frederick William Herschel - Astronomy - 1851 - 706 pages
...probably was, independent of any knowledge of Newton's, though Hutton insinuates the contrary. tween the first and last directions of a ray which has suffered...twice the inclination of the reflecting surfaces to each other." Let AB be the limb, or graduated arc, of a portion of a circle 60° in extent, but divided... | |
 | John Frederick William Herschel - Astronomy - 1853 - 608 pages
...The principle of this instrument is the optical property of reflected rays, thus announced : — " The angle between the first and last directions of...twice the inclination of the reflecting surfaces to each other. Let AB be the limb or graduated . arc, of a portion of a circle 60° in extent, but divided... | |
 | James Rosser - 1877 - 174 pages
...its proper left to right. The Sextant and similar instruments are constructed on the principle that the angle between the first and last directions of a ray which has suffered two reflexions in one plane is equal to twice the inclination of the reflecting surfaces to each other.... | |
 | William Henry Rosser - 1877 - 158 pages
...principle that the angle between the first and last directions of a ray which has suffered two reflexions in one plane is equal to twice the inclination of the reflecting surfaces to each other. The principle on which the Vernier is graduated is as follows: — An arc containing a... | |
 | Thomas Liddell Ainsley - 1880 - 482 pages
...consider here. The principle of the sextant is this:— The angle between the first and last direction of a ray which has suffered two reflections in one...twice the inclination of the reflecting surfaces to each other. On the Sextant. by hand, the screw is again to be fixed, and a tangent screw «' enables... | |
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