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Updated: June 9, 2025
Neither word nor look of love had passed his lips or lightened his eyes; and even now, as he stood beside her, looking at her face, beautiful still even in that ghastly light, his glance was as steady as if he had been looking through the eye-piece of his telescope.
Lord Westerham, as the guest, had the first look at the approaching World Peril; then Mr Parmenter took a long squint into the eye-piece and then they sat down, and Lennard told Mr Parmenter, in the cold, precise language of science, the story which he had already told to Auriole and Lord Westerham.
Beneath the barrel of the back-sight is an observing glass with an eye-piece for the artillerist, while above and behind the observing glass is another eye-piece, to be used in conjunction with the manipulation of the back-sight.
Herschel said: "The double eye-piece must be left to amateurs and to those who, for some particular object, require a large field of vision." Herschel assigns the date of 1776 to the experiments which he made to decide this question. In what did these lenses differ from the double convex lenses?
The work of fitting the objective into one end of a tin tube of double thickness, and properly adjusting it, will probably be quite within the powers of the ordinary amateur. The fitting of the eye-piece into the other end of the tube will require some skill and care both on his own part and that of his tinsmith.
The eye-piece of the telescope must be protected now with leather, for the skin is destroyed that comes in contact with cold metal. The voice at a mile's distance can be heard distinctly. Happy the day when first the sun is seen to graze the edge of the horizon; but summer must come, and the heat of a constant day must accumulate, and summer wane, before the ice is melted.
Then the eye-piece had to be unscrewed and replaced again and again, till at last Uncle Richard declared that he could do no more. "Then now we may begin?" cried Tom. "We might," said his uncle, "for the moon will be just right to-night in the first quarter; but judging from appearances, we shall have a cloudy wet evening."
About the same time an equally beneficial step was the employment of the telescope as a pointer; not the Galilean with concave eye-piece, but with a magnifying glass to examine the focal image, at which also a fixed mark could be placed. Kepler was the first to suggest this. Gascoigne was the first to use it.
I also tried to make a telescope by purchasing a lens of about 2 ft. focus at an optician's in Swansea, fixing it in a paper tube and using the eye-piece of a small opera-glass. With it I was able to observe the moon and Jupiter's satellites, and some of the larger star-clusters; but, of course, very imperfectly.
It is satisfactory to find this novel impulse not only shared, but to a large extent guided, by our countrymen. William Rutter Dawes, one of many clergymen eminent in astronomy, observed, in 1852, with the help of a solar eye-piece of his own devising, some curious details of spot-structure.
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