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Show Camera Piimck the Erwer Elusive Poles slderable Increase In the number of Instruments In-struments suitable for such findings. There are only five In the world, three of them In this country. In accord with this idea, Professor Schleslnger is hopeful thnt his camera may prove entirely en-tirely successful and that It will be generally adopted and necessary observations obser-vations made with it without additional expense at other points. Study of the north pole field alone tins brought many Interesting discoveries, discov-eries, chief of which are: the earth, taken as a whole, Is as rigid bb the strongest structural steel and the land in the northern hemisphere Is creeping creep-ing northward at the rate of one foot a year. This latter, although apparently Insignificant, Is of major Interest to science. When Tale's new 26-Inch telescope Is set up in some land south of the equator, equa-tor, probably New Zealand or South Africa, the zenith camera will be used to study and measure the stars of the southern heavens. Can Place Location Within Two Feet in Wanderings in Area of 80 Square Feat. New Haven. Conn. Prof. Frank Schleslnger, director of Yale university observatory, has perfected what Is to be known as the Zenith camera. Tlnal experiments carried out here for over a month bnve proved successful. What is to be the exact value of this new "find" for the field of astronomy Is, of course, unknown, but men well versed In scientific study of the heavens have already planned important tasks for the apparatus. The optical principles of the Zenith camera were perfected some years ago by the English astronomer royal, George Airy, but all the new automatic features were designed and perfected by Professor Schleslnger, who first sturted woik upon the Instrument In 1911. For the last year Yale's noted astronomer worked vigorously for the completion of the camera, and except for a few minor changes It is now able to achieve all for which it was planned. Accurate Measurements. By photographing certain stars as they come Into focus, the Zenith camera makes possible accurate measurements of the varying latitudes of this world. The focus of the camera Is directed through a huge telescope, so placed that only those stars passing exceedingly exceeding-ly close to the zenith will be photographed. photo-graphed. A plate is Inserted In the camera at nightfall and, after figuring a time scale with utmost accuracy, a delicate clock system In alarm form Is carefully attached. Then all action is automatic until the plate Is removed by an operator before morning light harms It When the proper time comes the shutter of the camera opens and any stars within focus leave a sharply defined de-fined path on the plate as they pass westward beside the zenith. After a few seconds the shutter closes and a valuable picture Is ready for the methodical me-thodical calculations of astronomical science. By measuring distances between certain cer-tain stars appearing on the picture various positions of the north pole are found. And since it has recently been discovered that the "pole" does not stay at the same point on the earth's surface, but wanders about in a space 80 feet square, such findings are of intrinsic value. Explorers In the Far North could possibly locate the pole within a mile of Its proper position. The zenith camera can locate it within two feet. Locates North Pole. Motions of the pole prove so complicated com-plicated and in some respects their cause is so obscure that astronomers are agreed that there should be a con- |