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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.
The 16 Divisions of construction, as defined by the Construction Specifications Institute (CSI)'s MasterFormat, is the most widely used standard for organizing specifications and other written information for commercial and institutional building projects in the U.S. and Canada.
The oldest construction drawing is in the Temple of Apollo at Didyma. An unfinished stone wall was etched with the profiles of columns and mouldings, and the wall was never finished so the drawing was not erased: a rare glimpse into the history of working construction drawings. [2]
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A book review is a form of literary criticism in which a book is merely described (summary review) or analyzed based on content, style, and merit. [ 1 ] A book review may be a primary source , an opinion piece, a summary review, or a scholarly view. [ 2 ]
The company was purchased by Hitachi Construction Machinery Co. Ltd. and is now producing a range of models of truck under the Hitachi name, although it is commonly branded as a Euclid, and several components bear the Euclid name. There are two classes of the machines currently in production: both are "rigid dumper" models (dump trucks with a ...