United States or Honduras ? Vote for the TOP Country of the Week !
Besides, it will show that J.T. Marston, their faithful friend and a man every way worthy of the friendship of such men, was only losing his time while mirroring the Moon in the speculum of the gigantic telescope on that lofty peak of the mountains.
I know not whether I should on this Occasion take notice, that when, as when looking upon the Calm and Smooth Surface of a River betwixt my Eye and the Sun, it appear'd to be a natural Speculum, wherein that Part which Reflected to my Eye the Entire and defin'd Image of the Sun, and the Beams less remote from those which exhibited That Image, appear'd indeed of a great and Whitish Brightness, but the rest Comparatively Dark enough: if afterwards the Superficies chanc'd to be a little, but not much troubled, by a gentle Breath of Wind, and thereby reduc'd into a Multitude of Small and Smooth Speculums, the Surface of the River would suitably to the Doctrine lately deliver'd, at a Distance appear very much of Kin to White, though it would lose that Brightness or Whiteness upon the Return of the Surface to Calmness and an Uniform Level.
The fourth division consisted of the thumb-screw, speculum oris, and chains and shackles of different kinds, collected at Liverpool. To these were added, iron neck-collars, and other instruments of punishment and confinement used in the West Indies, and collected at other places.
Their uniform success encouraged him to enlarge his aims, and in 1844 he visited Birr Castle for the purpose of inspecting the machine used in polishing the giant speculum of Parsonstown. In the construction of his new instrument, however, he eventually discarded the model there obtained, and worked on a method of his own, assisted by the supreme mechanical skill of James Nasmyth.
And, after all, in those days a poet was lucky if they only burnt his poems, and not himself as well. In 1619 John Williams, barrister, was actually hanged, drawn, and quartered, for two poems which were not even printed, but which exist in manuscript at Cambridge to this day. These were Balaam's Ass and the Speculum Regale.
David was breathing regularly, so loudly sometimes that Tom felt disposed to rouse him up; but each time the breathing became easier, and he refrained. "I don't mind," thought Tom. "I dare say he is very tired, and I don't want to talk to him. He's company all the same, even if he is asleep. Wonder whether this speculum will turn out all right."
"Oh, how I should like to be behind him with a stick!" thought Tom; and he laughed to himself as he turned away and went down, to find that his uncle had just uncovered the great speculum they had ground and polished, where it stood upon a stout shelf at the far side of the workshop, and was pointing out its perfections to the Vicar.
In my early use of the telescope I had fitted the speculum into a light square tube of deal to which the eye-piece was attached, so as to have all the essential parts of the telescope combined together in the most simple and portable form.
Sir John Herschel tells us that "the total thickness to be abraded from the edge of a spherical speculum 48 inches in diameter and 40 feet focus, to convert it into a paraboloid, is only 1/21333 of an inch;" yet upon this minute difference of form depends the clearness of the image, and, as a consequence, the entire efficiency of the instrument.
D. Counterpoise, By which the chill plate is tilted up The largest figure in the engraving is the annealing tub of cast iron filled with sawdust, where the speculum is placed to cool as slowly as possible.
Word Of The Day