United States or American Samoa ? Vote for the TOP Country of the Week !
Secondly, the peculiar qualities which this singular mental constitution derived from his use of opium, qualities which, although they did not increase, or even give direction to his meditative power, at least magnified it, both optically, as to its visual capacity, and creatively, as to its constructive faculty.
For a telescope which has no micrometer, the Huyghenian or negative eye-piece, as it is commonly called, is the best. As made by Huyghens, it consists of two plano-convex lenses, with their plane sides next the eye, as shown in the figure. So far as we have yet described our telescope it is optically complete.
'We are now traversing distances beside which the immense line stretching from the earth to the sun is but an invisible point, said the youth. 'When, just now, we had reached a planet whose remoteness is a hundred times the remoteness of the sun from the earth, we were only a two thousandth part of the journey to the spot at which we have optically arrived now.
Ice and water are so optically alike that unless the light fall properly upon these flowers you cannot see them. But what is the central spot? A vacuum. Ice swims on water because, bulk for bulk, it is lighter than water; so that when ice is melted it shrinks in size. Can the liquid flowers then occupy the whole space of the ice melted? Plainly no.
It was the door to a veddy, veddy expensive apartment with equally expensive appointments. One wall, thirty feet long and ten feet high, was a nearly invisible, dustproof slab of polished, optically flat glass that gave the observer the feeling that there was nothing between him and the city street, five hundred feet below.
Neither of the objects distinguished by the striking variations just described is of gaseous constitution. That in Scorpio appears under high magnifying powers as a "compressed cluster"; that in Andromeda is perhaps, as Sir J. Herschel suggested, "optically nebulous through the smallness of its constituent stars" if stars they deserve to be called. On the 8th of December, 1891, Dr.
"How wondrous is the science of mechanism! how variegated its progeny, how simple, yet how compound! I am propelled to the consideration of this subject by having optically perceived that ingenious nautical instrument, which has just now flown along like a mammoth, that monster of the deep!
For communicating optically from ship to ship during the day, the marine uses flags of different forms and colors, and flames. Between ships and the land there are used what are called semaphore signals, which are made by means of a mast provided with three arms and a disk placed at the upper part.
Thus do these aged halls send back rarest melodies for the discordant notes received. The temperature of both Luray Caverns and Mammoth Cave is uniformly fifty-four degrees Fahrenheit throughout the year, and the atmosphere is both chemically and optically of singular purity. For this reason stone huts were once erected for consumptives in Mammoth Cave.
The genuineness of the "inner corona" to the height of 5' or 6' from the limb was admitted; but it was supposed that by the detailed reflection of its light in our air the far more extensive "outer corona" was optically created, the irregularities of the moon's edge being called in to account for the rays and rifts by which its structure was varied.
Word Of The Day