 | William Parsons (3rd earl of Rosse.) - 1844 - 78 pages
...tendency to elevate it; but as it reaches the perpendicular, these weights are prevented sinking down in a straight line by the other chains which are fixed...passes from the tube to the windlass over a pulley on a truss"boam, which runs from W to the same situation in the opposite wall — the pulley is not seenj... | |
 | Thomas Dick - Astronomical instruments - 1845 - 644 pages
...99. joint, which allows the tube to turn in all directions ; C the speculum in its tube ; D the box ; E the eye-piece ; F the moveable pulley ; G the fixed...truss-beam which runs from W to the same situation on the opposite wall — the pulley is not seen. X is a railroad on which the speculum is drawn either... | |
 | Thomas Dick - 1845 - 608 pages
...M. joint, which allows the tube to turn in all directions ; C the speculum in its tube ; D the box ; E the eye-piece; F the moveable pulley; G the fixed...truss-beam which runs from W to the same situation on the opposite wall — the pulley is not seen. X is a railroad on •which the speculum is drawn... | |
 | Thomas Dick - Astronomical instruments - 1848 - 408 pages
...turn in all directions , C, the speculum in its tube ; D, the box ; E, the eyepiece ; F, the movable pulley ; G, the fixed one ; H, the chain from the...truss-beam, which runs from W to the same situation on the opposite wall : the pulley is not seen ; X is a railroad, on which the speculum is drawn either... | |
 | Ormsby MacKnight Mitchel - Astronomy - 1848 - 302 pages
...H fixed to the lube, passes ; J is the chain from the beam to the counterpoise K- L the lever, and M the chain connecting it with the tube ; Z the chain...passes from the tube to the windlass, over a pulley situated at W; X is a railroad for removing the speculum or returning it to its place. When the tube... | |
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E the eye-piece ; F the moveable pulley ; G the fixed one ; H the chain from the side of the tube ; I the chain from the beam ; K the counterpoise ; L the lever ; M the chain connecting it with the tube ; Z the chain which passes from the tube to the... 