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Updated: June 9, 2025
"Yes, sir," replied Polton, "and the six-inch objective and the low-power eye-piece. Everything is in the case; and I have put 'special rapid' plates into the dark-slides in case the light should be bad." "Then we will go forth and beard the Scotland Yard lions in their den," said Thorndyke, putting on his hat and gloves.
I looked into the eye-piece, managed to get the tube pointed accurately, and then requested the astronomer to focus the lenses so as to bear upon the planetary light in range. He knew at once the planet I had singled out. He called it Zo-ide. After the focusing was completed, I looked and, behold, I could readily discern many of the physical features of my own world.
Herschel looked on the almost unanimous opinion of the double lens eye-piece being preferable to the single lens eye-piece, as a very injurious prejudice in science. On one occasion, this latter eye-piece would not show him the bands of Saturn, whilst by the aid of a single lens they were perfectly visible.
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.
Their exit, however, would not take them near Beale's prison. A few paces along the corridor was another passage leading to the yard above, and it was by this way that Hilda Glaum had sped to the doctor's room. Presently all were gone save one industrious worker, who sat peering through the eye-piece of his microscope, immovable.
"Ay, ay, sir," I replied, touching my hat; and five minutes later I was sitting in the main-topmast cross-trees, with the long barrel of the telescope steadied against the topmast-head, and my eye glued to the eye-piece.
Ludwig accompanied her to the door of her apartments, bade her good night, and returned to the observatory. Already the disk of the moon was half obscured. Ludwig removed the astronomical eye-piece from the telescope, and inserted the tellurian glass instead; then he turned the object-glass toward the neighboring manor instead of toward the moon.
At three minutes past ten that evening the Tsar looked into the eye-piece of the Greenwich Equatorial, and saw a double-winged yellow shape floating in the centre of the field of vision. He watched it for long minutes, listening to the soft clicking of the clockwork, which was the only sound that broke the silence.
For instance, if his telescope is three inches clear aperture, then his eye-piece should magnify one hundred and fifty times; if the aperture is four inches, one magnifying two hundred times may be used. This magnifying power is, as a general rule, about the highest that can be advantageously used with any telescope.
The clock consisted of a spy-glass, having a nichol or double-image prism for an eye-piece, and a thin plate of selenite for an object-glass. When the tube was directed to the North Pole that is, parallel to the earth's axis and the prism of the eye-piece turned until no colour was seen, the angle of turning, as shown by an index moving with the prism over a graduated limb, gave the hour of day.
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