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Sperry, Elmer Ambrose

(Encyclopedia)Sperry, Elmer Ambrose, 1860–1930, American inventor, b. Cortland, N.Y. Although probably best known for his work on the gyroscope, he also invented the gyrocompass (1910), an extremely effective hig...

vital statistics

(Encyclopedia)vital statistics, primarily records of the number of births and deaths in a population. Other factors, such as number of marriages and causes of death, by age groups, are regularly included. From thes...

Simcoe, Lake

(Encyclopedia)Simcoe, Lake, 539 sq mi (1,396 sq km), S Ont., Canada, between Georgian Bay and Lake Ontario. Cook Bay, Kempenfelt Bay, and Lake Couchiching are arms of the lake. Lake Simcoe drains N through the Seve...

employment bureau

(Encyclopedia)employment bureau, a government-run establishment for bringing together the employer offering work and the employee seeking it. As a not-for-profit service, employment bureaus operate differently from...

Mackenzie

(Encyclopedia)Mackenzie, river, c.1,120 mi (1,800 km) long, issuing from Great Slave Lake, Northwest Territories, Canada, and flowing generally NW to the Arctic Ocean through a great delta. Between Great Slave Lake...

American Samoa, The National Park of

(Encyclopedia)American Samoa, The National Park of, c.9,000 acres (3,645 hectares), American Samoa, S Pacific Ocean. Comprising areas on the islands of Ofu, Ta'u, and Tutuila, the park features the only paleotropic...

Hodgkin's disease

(Encyclopedia)Hodgkin's disease, a type of cancer of the lymphatic system. First identified in 1832 in England by Thomas Hodgkin, it is a type of malignant lymphoma. Incidence peaks in young adults and the elderly....

theosophy

(Encyclopedia)theosophy thēŏsˈəfē [key] [Gr.,=divine wisdom], philosophical system having affinities with mysticism and claiming insight into the nature of God and the world through direct knowledge, philosoph...

gauss

(Encyclopedia)gauss gous [key] [for C. F. Gauss], abbr. G, unit of magnetic flux density (see flux, magnetic) equal to 0.0001 (10−4) weber per square meter. Since this unit is derived from the cgs system of units...

elephantiasis

(Encyclopedia)elephantiasis ĕlˈəfăntīˈəsĭs [key], abnormal enlargement of any part of the body due to obstruction of the lymphatic channels in the area (see lymphatic system), usually affecting the arms, le...