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Updated: June 7, 2025
What was this strange communion? Who was this mysterious Pax? Were these real men or creatures of a grotesque dream? Was he not drowsing over his eyepiece in the meridian-circle room? Then a simultaneous movement upon the part of those gathered round the operator convinced him of the reality of what was taking place.
With the slightest magnifying this object splits up into two stars, of magnitudes four and seven, situated rather more than 40" apart. Next we shall need a rather low-power eyepiece and our largest aperture in order to examine a star cluster, No. 4173, which was especially admired by Sir William Herschel, who discovered that it was not, as Messier had supposed, a circular nebula.
Kennedy, before him, reached down into his pocket and handed him the spinthariscope. "You see that?" he demanded. Denison looked through the eyepiece. "Wh where did you get so much of it?" he asked, a queer look on his face.
In addition to the crater just mentioned, there are two smaller ones below the summit of the S. wall, and a small circular depression on the S.E. wall. Mr. W.H. Maw, F.R.A.S., has seen, with a 6 inch Cooke refractor, a bright marking at the N. extremity of the ring, which, when examined with a Dawes' eyepiece, resembled an imperfect crater.
He watched Carse snap on the automatic control and go to an electelscope which had been equipped with an infra-red device. He directed it rearward on Satellite III, back along the course the Sandra had described, and peered through its eyepiece for several minutes. Then he turned to the old scientist. "Nothing," he said. "No sign of the asteroid as yet. We'll have to keep careful watch.
It was just a bit, but he dissolved it in some liquid from a bottle on the table, filled one of the clean glass tubes, capped the open end, and placed this tube in the saccharimeter where the first one I noticed had been. Carefully he lighted the lamp, then squinted through the eyepiece at the tube of liquid containing what he had derived from the cartridge.
His face, turned from the electelscope, was alive with excitement. "Here! Look!" "What is it?" "The asteroid! It's close!" In two strides Carse was at the eyepiece of the infra-red glass attached to the instrument. One look through it served to verify Ban's report. The asteroid of Dr. Ku Sui had at last appeared.
What is known as a solar prism, consisting of two solid prisms of glass, cemented together in a brass box which carries a short tube for the eyepiece, and reflecting an image of the sun from their plane of junction while the major remnant of light and heat passes directly through them and escapes from an opening provided for the purpose serves very well.
Suppose, for example, we observe that the image of a star instead of being perfectly round is oblong, and that a similar defect appears in the form of the rings when the eyepiece is put out of focus. We know at once that something is wrong; but the trouble may lie either in the object glass, in the eyepiece, in the eye of the observer himself, or in the adjustment of the lenses in the tube.
It will be found that it is only on very rare occasions that he can accomplish much with powers which, perhaps only on two or three nights in a year in this climate, tell to great advantage; though it sometimes happens that the employment of an eyepiece, otherwise unsuitable for the night, will, during a short spell of good definition, afford a fleeting glimpse of some difficult feature, and thus solve a doubtful point.
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