![]() The donor purchased this object around 1965 and used it for about two years in airplane navigation. The patentees were employed by Felsenthal Instruments Co., which frequently supplied companies with the plastic for manufacturing Dalton computers in the 1950s and 1960s. The patent number on the back of this object refers to the design of the computer with the gridded rectangular sheet and two discs. It became a subsidiary of Boeing in 2000. made aeronautical charts and navigational tools and guides. Elrey Borge Jeppesen, a pilot for what became United Airlines, founded his company in 1934 and moved it to Denver in 1941. After the war, many manufacturers in the United States and Europe made the E-6B. The device was widely used during World War II. Army Air Corps and received a patent in 1937. Naval Reserve pilot Philip Dalton, in consultation with navigation instructor Philip Van Horn Weems, developed the Dalton dead reckoning computer for the U.S. A ring at the top of one black plastic bar is marked: U.S. The three lines in the clear part of the disc are illegible, but below the temperature conversion scale, the marks read: 3.5° F/1000'. The back of the disc is also marked in pencil. The grid is marked in pencil: FLT OFF COURSE (/) 2 MILES/SQUARE. It also is marked: WEEMS SYSTEM OF NAVIGATION (/) (A DIVISION OF JEPPESEN & CO.) (/) DENVER, COLORADO PAT. ![]() The device is marked on the front: DALTON DEAD RECKONING COMPUTER (/) TYPE E-6B. A salmon plastic sheath stores the instrument. ![]() The center of the back disc is clear for viewing the grid. The back disc has a scale to correct direction readings for wind and a scale for converting temperature readings from degrees Centigrade to Fahrenheit. The front disc has scales for altitude computations at the top and for air speed computations at the bottom. The sheet is marked in green on both sides, with a polar grid and rectangular grid on one side and a polar grid on the other side. Description In this instrument a white rectangular plastic sheet slides between two white discs that are held together with black plastic bars and metal grommets. Eliot Elisofon Photographic Archives, African Art.
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