 | Robert Woodhouse - 1821 - 1068 páginas
...the meridian. We will now, then, proceed to explain the Transit Telescope, or Transit Instrument t. Let AD represent a telescope fixed, as it is represented...make our times of observation, those in which the limits of the Sun are in contact with the wires of the instrument. Since the Sun does not, like a star,... | |
 | Thomas Curtis - 1829 - 852 páginas
...line of sight of the telescope, may move in the plane of the meridian. 817. Let AD, plate X. fig. 1, represent a telescope fixed, as it is represented...like the upper part of a Y, and denominated Y's. The Y"'s are placed in two dove-tailed brass grooves, fastened in two stone pillars, E and VV, so erected... | |
 | Thomas Curtis (of Grove house sch, Islington) - 1839 - 906 páginas
...telescope, may move in the plane of the (J17. Let AD, plate X. fig. I, represent a telescope filed, as it is represented in the figure, to an horizontal...in form like the upper part of a Y, and denominated Vs. The Y's are placed in two dove-tailed brass grooves, fastened in two stone pillars, E and W, so... | |
 | William Augustus Norton - 1839 - 530 páginas
...into two perfectly equal cylinders; which cylindrical ends are called Pivots. TRANSIT INSTRUMENT. 23 These pivots rest on two angular bearings, in form...denominated Y's. The Y's are placed in two dove-tailed brass grooves fastened in two stone pillars E and W, so erected as to be perfectly steady. One of the grooves... | |
 | William Augustus Norton - 1852 - 522 páginas
...represents a fixed transit instrument. AD is a telescope, fixed, as it is represented in the figure, to a horizontal axis formed of two cones.- The two small...denominated Y's. The Y's are placed in two dove-tailed brass grooves fastened in two stone pillars E and W, so erected as to be perfectly steady. One of the grooves... | |
 | William Augustus Norton - 1853 - 522 páginas
...represented in the figure, to a horizontal axis formed of two cones. The two small ends of these cones arc ground into two perfectly equal cylinders ; which...denominated Y's. The Y's are placed in two dove-tailed brass grooves fastened in two stone pillars E and W, so erected as to be perfectly steady. One of the grooves... | |
 | William Augustus Norton - 1867 - 636 páginas
...axis terminates in two steel pivots, V, accurately turned to the cylindrical shape, and of equal size. These pivots rest on two angular bearings, in form like the upper part of a Y, and called Y's. The Y's are notches cut in two blocks of metal, set in metallic boxes ; the latter being... | |
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AD is a telescope, fixed, as it is represented in the figure, to a horizontal axis formed of two cones.- The two small ends of these cones are ground into two perfectly equal cylinders ; which cylindrical ends are called Pivots. These pivots rest on two... 