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21Single-handed sailing — The sport of single handed sailing is sailing with only one crewmember (ie. only one person on board the vessel). The term is usually used with reference to ocean and long distance sailing, and particularly competitive sailing. Terminology In… …
22Wankel engine — The Wankel engine is a type of internal combustion engine which uses a rotary design to convert pressure into a rotating motion instead of using reciprocating pistons. Its four stroke cycle is generally generated in a space between the inside of… …
23Tesla turbine — The Tesla turbine is a bladeless centrifugal flow turbine expander patented by Nikola Tesla in 1913. It is referred to as a bladeless turbine because it uses the boundary layer effect and not a fluid impinging upon the blades as in a conventional …
24Pfund telescope — The Pfund telescope, originated by A. H. Pfund, provides another method for achieving a fixed telescope focal point in space regardless of where the telescope line of sight is pointed. This configuration utilizes a two axis feed flat mirror to… …
25Acorn — The acorn is the nut of the oak tree (genera Quercus , Lithocarpus and Cyclobalanopsis , in the family Fagaceae). It is a nut, containing a single seed (rarely two seeds), enclosed in a tough, leathery shell, and borne in a cup shaped cupule.… …
26Clarissa Eden, Countess of Avon — The Countess of Avon Spouses of the Prime Ministers of the United Kingdom In office 7 April 1955 – 9 January 1957 Preceded by Clementine, Lady Churchill Succeeded by Lady Dorothy Macmillan …
27Ford DLD engine — The Ford DLD engine is an automobile engine family a group of compact straight 4 Diesel engines developed jointly by Ford Motor Company and the PSA Group (Peugeot/Citroën). The Ford/PSA joint venture for the production of the DLD was announced in …
28Turbofan — [ CFM56 3 turbofan, lower half, side view.] A turbofan is a type of jet engine, similar to a turbojet. It essentially consists of a ducted fan with a smaller diameter turbojet engine mounted behind it that powers the fan. Part of the airstream… …
29Christopher Smart — Born 11 April 1722(1722 04 11) Shipbourne, England Died 21 May 1771(1771 05 21) (age …
30Vacuum pump — A vacuum pump is a device that removes gas molecules from a sealed volume in order to leave behind a partial vacuum. The vacuum pump was invented in 1650 by Otto von Guericke. Types Pumps can be broadly categorized according to three… …
