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D003119. [ edit on Wikidata] The Ishihara test is a color vision test for detection of red–green color deficiencies. It was named after its designer, Shinobu Ishihara, a professor at the University of Tokyo, who first published his tests in 1917. [ 2] The test consists of a number of Ishihara plates, which are a type of pseudoisochromatic plate.
A try square or try-square is a woodworking tool used for marking and checking 90° angles on pieces of wood. Though woodworkers use many different types of square, the try square is considered one of the essential tools for woodworking. [ 1] The square in the name refers to the 90° angle. To try a piece of wood is to check if the edges and ...
The most accurate pendulum clocks were controlled electrically. [166] The Shortt–Synchronome clock, an electrical driven pendulum clock designed in 1921, was the first clock to be a more accurate timekeeper than the Earth itself. [167] A succession of innovations and discoveries led to the invention of the modern quartz timer.
e. The Daily Telegraph, known online and elsewhere as The Telegraph, is a British daily broadsheet newspaper published in London by Telegraph Media Group and distributed in the United Kingdom and internationally. It was founded by Arthur B. Sleigh in 1855 as The Daily Telegraph and Courier. [ 7] The Telegraph is considered a newspaper of record ...
The larger Sunday crossword, which appears in The New York Times Magazine, is an icon in American culture; it is typically intended to be a "Thursday-plus" in difficulty. [6] The standard daily crossword is 15 by 15 squares, while the Sunday crossword measures 21 by 21 squares.
The American Crossword Puzzle Tournament (ACPT) is a crossword-solving tournament held annually in February, March, or April. Founded in 1978 by Will Shortz , who still directs the tournament, it is the oldest and largest crossword tournament held in the United States ; the 2023 event set an attendance record with more than 750 competitors.
The history of navigation, or the history of seafaring, is the art of directing vessels upon the open sea through the establishment of its position and course by means of traditional practice, geometry, astronomy, or special instruments. Many peoples have excelled as seafarers, prominent among them the Austronesians ( Islander Southeast Asians ...
Certificate – X, U, PG, R, G (from the film certificates) Charged – ION. Charlie – C ( NATO phonetic alphabet) Chartered accountant – CA. Chief – CH. Chlorine – CL (chemical symbol) Chromosome – X or Y. Church – CH or CE ( Church of England) or RC ( Roman Catholic) Circa – C.