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Sydney, city, Canada

(Encyclopedia)Sydney, city (1991 pop. 26,063), Cape Breton Island, N.S., Canada, on the northeast coast at the head of the South Arm of Sydney Harbour. It is the port and the commercial, trade, and industrial cente...

brazing

(Encyclopedia)brazing, method of joining metal parts using nonferrous filler metals with high melting points such as copper, silver, and aluminum alloys. Brazing differs from soldering (see solder) by using a highe...

alumina

(Encyclopedia)alumina əlo͞oˈmĭnə [key] or aluminum oxide, Al2O3, chemical compound with m.p. about 2,000℃ and sp. gr. about 4.0. It is insoluble in water and organic liquids and very slightly soluble in stro...

lapis lazuli

(Encyclopedia)lapis lazuli lăpˈĭs lăzˈo͝olē [key], gem, deep blue, violet, or greenish blue in color and usually flecked with yellow iron pyrites. It is composed of lazurite, a complex sodium aluminum silica...

Douglas, cities, United States

(Encyclopedia)Douglas. 1 City (2020 pop. 16,534), Cochise co., SE Ariz., at the Mexican border; inc. 1905. The mining and smelting of copper have been ...

Penetanguishene

(Encyclopedia)Penetanguishene pĕnˌətăngˌgəshēnˈ, –gwəshēnˈ [key], town (1991 pop. 6,643), S Ont., Canada, on Penetanguishene Bay, an inlet of Georgian Bay. The name is a Native American word for “whi...

Podgorica

(Encyclopedia)Podgorica pōdˈgōrētsä [key], city (2011 pop. 185,937), capital and largest city of Montenegro, SE Montenegro, at the confluence of the Ribnica and Morača rivers. A commercial center, it has indu...

platform tennis

(Encyclopedia)platform tennis, version of lawn tennis played on an elevated wooden or aluminum court that is one fourth the size of a standard court, usually by doubles teams. Unlike lawn tennis, platform tennis al...

ruby

(Encyclopedia)ruby, precious stone, the transparent red variety of corundum, found chiefly in Myanmar, Thailand, and Sri Lanka and classified among the most valuable of gems. The Myanmarese stones are blood red, th...

Tamworth

(Encyclopedia)Tamworth, city (1991 pop. 63,260) and district, Staffordshire, W central England. Its products include clothing, textiles, and aluminum ware. An amusement park and zoo are nearby. Tamworth was burned ...