Word: lensed
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Dates: during 1920-1929
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The observatory will be erected on Mt. Saleve, on French territory, a few miles from Geneva. The total cost is estimated at $6,000,000. The diameter of the lens will be 105 inches; at Mt. Wilson it is 101 inches.
Today (Sept. 10, 1923), if you happen to live anywhere in the U. S., Canada, Mexico, Central America, the West Indies, or northwestern South America, you can see, w. p. (weather permitting), at least part of a total eclipse of the sun. If you are fortunate enough to be within...
The device is in reality a small microscope, about the size of a pocket flashlight, with a strong lens at one end and a powerful light at the other. A small incision is made directly over the heart, and the cardioscope inserted. It enables the surgeon to see the heart...
...warm, made it necessary to develop the plates in warm solutions, which often resulted in flukes or distortions in the photographs. Then again, since the cameras were not pointed directly at the starts, but received the solar and star rays by means of mirrors reflecting, the light into the lenses, the images of the stars were subjected to distortions even before they reached the camera lens, because the mirrors expanded or contracted with the slightest change in temperature. A third criticism arose over the method of measuring these plates used by the Greenwich Observatory. to the ordinary individual it would...
...specially constructed cameras were made,--the diameter of the lens being five inches and the focal length 15 feet. These cameras had refracting lenses and were pointed directly at the point in the sky where the eclipse would occur. This avoided any distortions due to expanding and contracting mirrors. The photographic plates were of plate glass and were 17 inches square. The temperate climate of Australia further facilitated matters...