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The pocket-sized Hewlett-Packard HP-35 scientific calculator was the first handheld device of its type, but it cost US$395 in 1972. This was justifiable for some engineering professionals, but too expensive for most students. Around 1974, lower-cost handheld electronic scientific calculators started to make slide rules largely obsolete.
Several trainees became famous, including Henry "Hap" Arnold, who rose to Five-Star General, commanded U.S. Army Air Forces in World War II, and became the first head of the U.S. Air Force; Calbraith Perry Rodgers, who made the first coast-to-coast flight in 1911 (with many stops and crashes) in a Wright Model EX named the "Vin Fiz" (after the ...
Determining the angle of the Earth's magnetic field with respect to the horizontal plane. Showing a deviation from the true vertical or horizontal. Surveying, to measure an angle of inclination or elevation. Alerting an equipment operator that it may tip over. Measuring angles of elevation, slope, or incline, e.g. of an embankment.
Calculating a Gann angle is equivalent to finding the derivative of a particular line on a chart in a simple way. [1] A Gann angle is a straight line on a price chart, giving a fixed relation between time and price. For Gann the most important angle was the line which represented one unit of price for one unit of time, called the 1x1 or the 45 ...
Primes that are the concatenation of the first n primes written in decimal. 2, 23, 2357 (OEIS: A069151) The fourth Smarandache-Wellin prime is the 355-digit concatenation of the first 128 primes that end with 719.
The first commercially available version of the tape was sold for use as a wire-harness wrapping. This original electrical tape wasn't black. [5] Tapes formulated for high-temperature were yellow, and later versions were white. Electrically insulating tapes are essential for enhancing functionality and reliability in a wide range of applications.
The Z1 was a motor-driven mechanical computer designed by German inventor Konrad Zuse from 1936 to 1937, which he built in his parents' home from 1936 to 1938. [1] [2] It was a binary, electrically driven, mechanical calculator, with limited programmability, reading instructions from punched celluloid film.