These, they say, are often crushed by the mother. The patentees report that the invention has proved effective in field tests, particularly in reducing the mortality of baby pigs. Their automatic suckling pig feeder is the size and shape of a brood sow, has a lighted eye, and emits the recorded sounds of a nursing animal. and Cora Lee Brown of Ankeny, Iowa, are inventors of what they call an artificial sow. The material is also said to be suitable for shielding nuclear‐chain reactors.Īlthough calcium‐aluminate cement is relatively expensive, the low‐cost matte is reported to reduce its cost below that of concrete made with portland cement and high‐density aggregates (sand and gravel).Īlfred W. Four inches of it are described as giving substantially the same protection against X‐rays and gamma rays as nine inches of ordinary concrete. Y., got Patent 3,122,513 for the high‐ density concrete. It is made of calcium‐aluminate cement and lead matte, a waste product of lead smelting. Among the more than 200 floating objects identified is a long‐weighted wire from a Transit satellite.Ī concrete patented this week by a New York metallurgical engineer is said to form an effective radiation shield and to be especially resistant to sea water. Thought to have been deorbited, it was found instead to have been thrust into a higher orbit. Tne “lost” satellite was an early member of the Discoverer series. Easton, head of the Space Surveillance branch of the Naval Research Laboratory here, obtained Patent 3,122,741 for the Navy. Results are reported to the Colorado Springs headquarters of the North American Defense Command. The Naval Weapons Laboratory at Dahlgren, Va., operates the tracking and prediction center and maintains a display of present satellites on a screen map.
Transmitters send up continuous waves in fanlike patterns, and receivers spot objects by the angle of the reflected signals. The system is an electronic fence stretched across the southern United States from Savannah, Ga., to San Diego, Calif. The military purpose is to detect hostile reconnaissance satellites that may have nonreflecting surfaces and furnish signals only on command. The Navy's space‐surveillance system, which picks out silent (nonradiating) satellites, was patented this week.Īmong other objects, it has discovered and catalogued a “lost” American satellite, two unmanned Russian satellites, and many extinct boosters and other pieces of so‐called space junk.
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