The Monster Telescopes, Erected by the Earl of Rosse, Parsonstown: With an Account of the Manufacture of the Specula, and Full Description of All the Machinery Connected with These Instruments |
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Page 35
... horizontal by means of spirit levels , and was surrounded by a wooden frame ; a wooden pattern , the exact size of the Speculum , being placed on the iron , sand was well packed between it and the frame and the pattern was removed ...
... horizontal by means of spirit levels , and was surrounded by a wooden frame ; a wooden pattern , the exact size of the Speculum , being placed on the iron , sand was well packed between it and the frame and the pattern was removed ...
Page 38
... horizontal , but when pointed to the north it only falls until it is parallel with the earth's axis , pointing then to the pole of the heavens ; a lower position would be useless , for as all ce- lestial objects circumscribe that point ...
... horizontal , but when pointed to the north it only falls until it is parallel with the earth's axis , pointing then to the pole of the heavens ; a lower position would be useless , for as all ce- lestial objects circumscribe that point ...
Page 41
... horizontal position , it then rests on the ground , and is , of course , no load on the tube , which is when this happens 30 ° F. above the horizon . Below this point the tube is sufficiently heavy to descend when the windlass unrolls ...
... horizontal position , it then rests on the ground , and is , of course , no load on the tube , which is when this happens 30 ° F. above the horizon . Below this point the tube is sufficiently heavy to descend when the windlass unrolls ...
Page 45
... horizontal position , to do all the work ; it then commences opposing it , but it now has the help of the increasing weight of the tube itself , and so all the parts are elegantly blended into one another with the most perfect concord ...
... horizontal position , to do all the work ; it then commences opposing it , but it now has the help of the increasing weight of the tube itself , and so all the parts are elegantly blended into one another with the most perfect concord ...
Page 47
... horizontal , shows the angle at which the Telescope is placed and points out the declination . The scale for giving the right ascension is marked to lengths of a minute at the equator , which is 2-22 inches . We will now show how the ...
... horizontal , shows the angle at which the Telescope is placed and points out the declination . The scale for giving the right ascension is marked to lengths of a minute at the equator , which is 2-22 inches . We will now show how the ...
Other editions - View all
The Monster Telescopes: Erected by the Earl of Rosse, Parsonstown, with an ... Thomas Woods No preview available - 2016 |
The Monster Telescopes, Erected by the Earl of Rosse, Parsonstown: With an ... Thomas Woods No preview available - 2010 |
Common terms and phrases
ADAM CLARKE Allen's anneal arrangement axle baskets beam brass bed cast iron centre cold water compound Speculum cool the metal counterpoise course crucibles double stars Dublin Dublin Evening Mail emery and water excentric exert eye-piece feet in diameter feet long fixed focal length follows the tube gallery Geographies Greenock grinding and polishing grooves ground hang heat horizontal inches and a-half increases instrument iron bottom iron circle jet of cold ladder layers of hoop-iron lever Lord Rosse Lord Rosse's Lordship's machinery manner manufacture melted metal gradually mirror MONSTER TELESCOPES mould move oven PARSONSTOWN passes the perpendicular perfect casting perfectly perpendicular position pieces pitch plates porosity prevent produced pulley rachet regulated resin right ascension rope runs sand side soldered Specula Speculum box Speculum metal spirit level success sufficiently temperature thick three feet three foot Speculum tube is elevated turned turpentine universal joint weight windlass zinc
Popular passages
Page 14 - It was not however, chosen for this situation on account of its superiority over the compound Speculum, as there could be scarcely any difference found to exist between them : there is, however, a slight diffraction of light, caused by the edges of the pieces of the latter, but it does not interfere to such a degree with its performance as to be taken into account. The processes of grinding and polishing were precisely similar in the case of each, and the machinery was the same. We premise that the...
Page 38 - 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 windlass over a pulley on a truss-beam which runs from W to the same situation on the opposite wall — the pulley is not seen.
Page 36 - ... built, 72 feet long, 48 high on the outer side, and 56 on the inner — the walls being 24 feet distant from each other, and lying exactly in the meridional line. When directed to the south, the tube may be lowered till it become almost horizontal ; but when pointed to the north, it only falls till it is parallel with the earth's axis, pointing then to the pole of the heavens. Its lateral movements take place only from wall to wall, and this commands a view for half an hour on each side of the...
Page 16 - This ball is connected with a lever acting upon some part of the machinery, which controls the power or regulates the amount of resistance, as already explained in the case of the governor. When the level of the water rises, the buoyancy of the ball causes it...
Page 35 - The diameter of the tube is 7 feet. It is fixed to mason-work in the ground, to a large universal hinge, which allows it to turn in all directions. At 12 feet distance on each side, a wall is built, 72 feet long, 48 high on the outer side, and 56 on the inner, the walls being 24 feet distant from each other, and lying exactly in the meridional line. When directed to the south, the tube may be...
Page 40 - F. with the horizon, and that it is required to elevate it, the windlass is turned, and the chain being shortened, the desired effect is produced; but the labour of this would be immense if the...
Page 49 - ... only encouraged those undertakings in others he would merit our praise; but when we see him, without losing sight of the duties of his station in society, give up so much time and expend so much money on those pursuits himself, and render not only his name illustrious but his rank...
Page 19 - When, however, the focal length neither increases nor diminishes, the abrasion will become uniform over the whole 20 surface producing a spherical figure. According, however, as the focal length (the actual average amount of abrasion during a given time being given) increases more or less rapidly, the nature of the curve will vary, and we might conceive it possible, having it in our power completely to control the rate at which the focal length increases, so to proportion the rate of that increase,...
Page 1 - Reflectors; and as the first object of experimenters had always been to increase the magnifying power and light "by the construction of as large a mirror as possible, so was it to this point that his Lordship's attention was also directed. Previous to his experiments, there had not been any instrument constructed, with the exception of Sir W.
Page 16 - ... surface; and KL the polisher, which is of cast-iron, and weighs (for a 36-inch speculum, to which also the other dimensions above specified correspond) about 2-£ cwt. ; M is a round disc of wood connected with the polisher by strings hooked to it in six places, each two-thirds of the radius from the centre. At M there is a swivel and hook, to which a rope is attached, connecting the disc with a lever and counterpoise weight, so adjusted as to sustain the whole weight of the polisher, all but...