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Updated: June 8, 2025
He proceeded to make a Newtonian of nine inches aperture, which he erected in an observatory at his residence near Liverpool, happily named "Starfield." With this instrument he worked diligently, and detected the sixth star in the trapezium of Orion. In 1844 he conceived the bold idea of constructing a reflector of two feet aperture, and twenty feet focal length, to be mounted equatorially.
As the recognized cultural capital of continental Europe, Paris was a focal centre for visitors from many parts of the world, including the Orient.
'The whole immense power of the telescope was applied, and to its focal image about one half of the power of the microscope. On removing the screen of the latter, the field of view was covered throughout its entire area with a beautifully distinct and even vivid representation of basaltic rock.
From the totem pole to the national flag, from the wooden idol to God the Invisible King, from the magic word to some diluted version of Adam Smith or Bentham, symbols have been cherished by leaders, many of whom were themselves unbelievers, because they were focal points where differences merged.
The outermost ring is considerably brighter, however, than it would be if the same gradation applied to it as applies to the inner rings, and it is surrounded, moreover, on its outer edge by a slight flare which tends to increase its apparent width. Next let us return to the focus and then move the eyepiece gradually inside the focal point or plane.
Or rather, the toil is its own reward, if pursued in the lofty spirit which alone becomes it. For it leads through the abysses of space and the unending vistas of time to the very threshold of that infinity and eternity of which the disclosure is reserved for a life to come. The tube was thereby enabled to be shortened by twice the focal length of the mirror in question. Trans., vol. xc., p. 70.
The Empire of the Celestials was made the focal point of a great propaganda, openly espoused by the Emperor. It was readily demonstrated that Great Britain had no permanent control of commerce in the East, not even in her own possessions. The Teuton, for a time content with trifling profit, underbid all rivals and orders and contracts poured into Germany.
A mere cork, a tiny dark object like that, drifting along some distance out, would make a focal point in the fog, and would give the illusion of a clearance. Once, parading the deck as the man on watch, giving an occasional shake to the bell, I went suddenly happy with the certainty that I was now to be the harbinger of good tidings to those below playing cards.
To attack a tone, the breath must be directed to a focal point on the palate, which lies under the critical point for each different tone; this must be done with a certain decisiveness. There must, however, be no pressure on this place; for the overtones must be able to soar above, and sound with, the tone.
Those taken on the American plan of using telescopes of so great focal length as to afford, without further enlargement, an image of the requisite size, gave notably better results. On the whole, estimates of the great spatial unit cannot be said to have gained any security from the combined effort of 1874. A few months before the transit, Mr.
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