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Wooden ellipsograph (ca. 1900) now at Smithsonian Ellipsograph on display at Musée d'histoire des sciences de la Ville de Genève. An ellipsograph is a trammel of Archimedes intended to draw, cut, or machine ellipses, e.g. in wood or other sheet materials. An ellipsograph has the appropriate instrument (pencil, knife, router, etc.) attached to ...
A display board, also known as poster board, is a board-shaped material that is rigid and strong enough to stand on its own, and generally used paper or other materials affixed to it. Along with quad charts , display boards were an early form of fast communication developed by the National Weather Service of the United States Department of ...
By 1885, the Board had sold 1,975 copies of Price's plans. In 1889, Price reacquired the rights to his designs from the Board. [ 1 ] In the 1892 edition of "Church Plans," Price wrote that he had sold 600 copies of his plans in 1891 and that a total of 5,350 plans had been sold through December 31, 1891. [ 2 ]
A production board is not to be confused with a stripboard used for electronics prototyping. Historically, strip boards were manually assembled by hand on specially-made multi-panel boards made of vinyl or wood, about 15 to 18 inches tall (38 to 45 cm), whose panels could be easily folded up. [3]
Tracing boards are painted or printed illustrations depicting the various emblems and symbols of Freemasonry. They can be used as teaching aids during the lectures that follow each of the Masonic Degrees , when an experienced member explains the various concepts of Freemasonry to new members.
A combination between a whiteboard and a cork bulletin board Original early 1960s ad for "Plasti-slate", the first whiteboard/dry erase board invented by Martin Heit. It has been widely reported that Korean War veteran and photographer Martin Heit and Albert Stallion, an employee at Alliance, a leading flat rolled steel sheet supplier should be credited with the invention of the whiteboard in ...
The Signaltron main departure board at Praha-Smíchov station, Czech Republic (2012), manufactured by Pragotron Schematic of a split-flap display in a digital clock display An animation of how a split-flap display works Flap departure board at Gare du Nord, Paris (2007) Section of a split-flap display board at Frankfurt (Main) Hauptbahnhof (2005) Enlarged inner workings of a split-flap clock
Campus boards can take a variety of different forms and may incorporate a variety of materials. The earliest campus boards, still used today, were made of horizontal thin slats or wood rails attached to an inclined board in a ladder-like configuration. Later versions have utilized bolt-on climbing holds or sections of a pipe. A campus board is ...