Search results
Results from the WOW.Com Content Network
A simple dumbwaiter is a movable frame in a shaft, dropped by a rope on a pulley, guided by rails; most dumbwaiters have a shaft, cart, and capacity smaller than those of passenger elevators, usually 45 to 450 kg (100 to 992 lbs.) [2] Before electric motors were added in the 1920s, dumbwaiters were controlled manually by ropes on pulleys. [1]
George W. Cannon was an American inventor from New York.He is best known for the invention of the mechanical dumbwaiter.Cannon first filed for the patent of a brake system (US Patent no. 260776) that could be used for a dumbwaiter on January 6, 1883. [1]
Hoist atop an elevator. A hoist is a device used for lifting or lowering a load by means of a drum or lift-wheel around which rope or chain wraps. It may be manually operated, electrically or pneumatically driven and may use chain, fiber or wire rope as its lifting medium.
During the Second World War the company was one of the contractors engaged in building the Mulberry harbour units. [2] During 1981, the company was acquired by F J C Lilley plc, [3] which traded as Lilley plc from April 1989. [4] until it went into receivership during January 1993. [5] [6] Melville Dundas was bought out of receivership by its ...
A corporate history is a historical account of a business or other co-operative organization. Usually it is produced in written format but it can also be published as audio or audiovisually .
The ziggurats of Mesopotamia, the pyramids and Pharos of Alexandria in ancient Egypt, cities of the Indus Valley civilization, the Acropolis and Parthenon in ancient Greece, the aqueducts, Via Appia and Colosseum in the Roman Empire, Teotihuacán, the cities and pyramids of the Mayan, Inca and Aztec Empires, and the Great Wall of China, among many others, stand as a testament to the ingenuity ...
The company was founded by Adam van der Wal as a joiner's shop in 1869 in Groot-Ammers - a rural village in the Alblasserwaard region to the east of Rotterdam. [3] At the end of the 19th century, Adam's son, Jan van der Wal, took over the business and worked as a construction contractor not only in the Alblasserwaard region but at further afield locations, including Vlaardingen and The Hague ...
The Construction History Society (not to be confused with the Construction History Society of America) is a learned society that promotes the international study of the history of construction. [ 1 ] [ 2 ] Though based in Britain, it is interested in the history of construction of all countries and particularly how those histories inter-relate.