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Updated: June 7, 2025
She reaches those who need our help most and at times when they cannot afford to leave home and seek it. Her functions are innumerable. She is our eyepiece to keep us cognizant of our opportunities. She both treats and carries the sick and feeds the hospitals. She enables us to distribute our charity efficiently.
A few days of actual work on the canal, however proved that Count Platen had made no mistake. John knew what ought to be done, and he could show the soldiers new and better ways of getting results, although he was actually too small to reach the eyepiece of his leveling instrument without the aid of a camp-stool which he carried about with him.
The equivalent focal length of a positive or Ramsden eyepiece is equal to three fourths of the focal length of either of the lenses. If you are viewing the moon, or a planet, better results will always be obtained with lower powers say fifty to the inch at the most.
What new realms was I, first of all our human race, to enter? With furiously beating heart, I sat down before the huge instrument and adjusted the eyepiece. "Then I glanced around for some object to examine. On my finger I had a ring, my mother's wedding-ring, and I decided to use that. I have it here." He took a plain gold band from his little finger and laid it on the table.
Better and more costly is an apparatus called a helioscope, constructed on the principle of polarization and provided with prisms and reflectors which enable the observer, by proper adjustment, to govern very exactly and delicately the amount of light that passes into the eyepiece.
If the eyepiece is now drawn toward the observer, the star disk begins to expand; and if the mirror be a truly spherical one, the expanded disk will be equally illuminated, except the outer edge, which usually shows two or more light and dark rings, due to diffraction, as already explained.
If the telescope is a really good one, and both object glass and eyepiece are properly adjusted, the disk will be perfectly round, slightly softer at the edge, but otherwise equally bright throughout; and the ring or rings surrounding it will be exactly concentric, and not brighter on one side than on another.
If the experiment is tried in a room, a little ingenuity will enable the observer to arrange a curtain covering the window used, in such a way as to exclude all the light except that which comes through the telescope. Then, by placing a sheet of paper or a drawing board before the eyepiece and focusing the image of the sun upon it, very good results may be obtained.
The helmet type of respirator made of flannel was first tested in the Anti-Gas laboratories on May 10th, 1915, and was a great success compared with previously suggested types. Arrangements for its manufacture were accordingly made, and this began in June, 1915. This protective device consisted of a flannel helmet with a celluloid film eyepiece, and was called the hypo helmet.
For the determination of latitude and longitude there is nothing better than a small four or five inch theodolite not over fifteen pounds in weight. It should have a good prism eyepiece with an angle tube attached so it would not be necessary to break one's neck in reading high altitudes.
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