. Bulletin of the Southern California Academy of Sciences. Science; Natural history; Natural history. into the bottom of the gigantic telescope tube, where it will play its part in future astronomical research, and whence important discoveries are anticipated. The clear aperture of the so-called 100-incli mirror is nearly 101 inches. The depth of the curve in the center is one and one- fourth inches; the thickness of the finished glass at the edge is twelve and three-fourths inches; and the present weight of the glass is nearly 9,000 pounds—or four and a half tons. The area of the 101-inch mir
. Bulletin of the Southern California Academy of Sciences. Science; Natural history; Natural history. into the bottom of the gigantic telescope tube, where it will play its part in future astronomical research, and whence important discoveries are anticipated. The clear aperture of the so-called 100-incli mirror is nearly 101 inches. The depth of the curve in the center is one and one- fourth inches; the thickness of the finished glass at the edge is twelve and three-fourths inches; and the present weight of the glass is nearly 9,000 pounds—or four and a half tons. The area of the 101-inch mirrored surface is 8,012 square inches—a trifle over square feet. The focal length of the mirror is inches—approximately feet. Dr. Walter S. Adams, Assistant Director of the Mount AMl- son Solar Laboratory, and having special direction of its large affairs during the frequent absence of Director Hale in the East and in Europe, has been closely identified with the development of the 100-inch telescope and the construction of the great ob- servatory building from the first. His special line of investiga- tion is stellar spectroscopy, and he hopes for important results from the use of the new telescope which it is expected will reveal stars in the Milky Way and in distant star clusters down to the 22nd magnitude. The large force in the Mount W'ilson Solar Observatory, the people of Southern California who have a special pride in the great enterprise, the attaches of all other observatories on the globe, and in fact all intelligent persons interested in the achieve- ments of astronomical science, will feel a sense of relief in, the successful completion of the great mirror and its safe housing in its permanent home on Mount \\' 57. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Southe
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