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 5
... fixed on a bed composed of zinc and copper , -mixed in the proportion 2.75 of the latter to 1 of the former - a species of brass , which expanded in the same degree by heat as the pieces of the Speculum themselves ; they were then ...
... fixed on a bed composed of zinc and copper , -mixed in the proportion 2.75 of the latter to 1 of the former - a species of brass , which expanded in the same degree by heat as the pieces of the Speculum themselves ; they were then ...
Page 22
... fixed a pole , to which is attached the dial of a watch ; there are trap doors which open , and by means of a temporary eye - piece at the calculated dis- tance , allow the figure of the dial to be seen in the Speculum brought to a ...
... fixed a pole , to which is attached the dial of a watch ; there are trap doors which open , and by means of a temporary eye - piece at the calculated dis- tance , allow the figure of the dial to be seen in the Speculum brought to a ...
Page 28
... fixed an axle , P , to which a small wheel is attached on either side , these run along a railway when the tube is elevated or depressed . The tube itself is counterpoised by the weight , B , hanging over the pulley , A. In order to ...
... fixed an axle , P , to which a small wheel is attached on either side , these run along a railway when the tube is elevated or depressed . The tube itself is counterpoised by the weight , B , hanging over the pulley , A. In order to ...
Page 37
... fixed to mason work in the ground by a large universal hinge which allows it to turn in all directions . At each side of it at twelve feet distance , a wall is built which is seventy - two feet long , forty - eight feet high on the ...
... fixed to mason work in the ground by a large universal hinge which allows it to turn in all directions . At each side of it at twelve feet distance , a wall is built which is seventy - two feet long , forty - eight feet high on the ...
Page 39
... chains which run from its sides over the pulleys , and so have a tendency to elevate it ; but as it reaches the perpen- dicular , these weights are prevented sinking down in a straight line by the other chains which are fixed to 39.
... chains which run from its sides over the pulleys , and so have a tendency to elevate it ; but as it reaches the perpen- dicular , these weights are prevented sinking down in a straight line by the other chains which are fixed to 39.
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...