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A hornbook (horn-book) is a single-sided alphabet tablet, which served from medieval times as a primer for study, [1] and sometimes included vowel combinations, numerals or short verse. [2] The hornbook was in common use in England around 1450, [ 3 ] but may have originated more than a century earlier. [ 4 ]
Gabriel's horn is formed by taking the graph of =, with the domain and rotating it in three dimensions about the x axis. The discovery was made using Cavalieri's principle before the invention of calculus , but today, calculus can be used to calculate the volume and surface area of the horn between x = 1 and x = a , where a > 1 . [ 6 ]
The alphorn or alpenhorn or alpine horn is a labrophone, consisting of a straight several-meter-long wooden natural horn of conical bore, with a wooden cup-shaped mouthpiece. Traditionally the Alphorn was made of one single piece, or two parts at most, of the wood of a red pine tree. Sometimes the trees would bend from the weight of snow in ...
B♭ alto — up a perfect fourth. A — up a major third. G — up a major second. E — down a minor second. E♭ — down a major second (used for horn on pitches with multiple sharps until Richard Strauss) D — down a minor third. C — down a perfect fourth. B♭ basso — down a perfect fifth. Some less common transpositions include:
The bore of the French horn is small, between 10.8 and 11 mm, compared to 11.5 mm for the German horn, but not as small as the Vienna horn at 10.7 mm. These narrow-bore French instruments are equipped with piston valves (also called Périnet valves, after their inventor), unlike today's more usual orchestral (German) horns, which have rotary ...
Horn-satisfiability. In formal logic, Horn-satisfiability, or HORNSAT, is the problem of deciding whether a given set of propositional Horn clauses is satisfiable or not. Horn-satisfiability and Horn clauses are named after Alfred Horn . A Horn clause is a clause with at most one positive literal, called the head of the clause, and any number ...
The natural horn is a musical instrument that is the predecessor to the modern-day (French) horn (differentiated by its lack of valves). Throughout the seventeenth and eighteenth century the natural horn evolved as a separation from the trumpet by widening the bell and lengthening the tubes. [ 1] It consists of a mouthpiece, long coiled tubing ...
Hayrake table. A hayrake table is a distinct pattern of table produced as part of the English Arts and Crafts movement in the early part of the twentieth century. [ 3] Its distinctive feature is the arrangement of the lower stretcher between the legs as a double-ended Y-shape. The shape of each end, and their joinery, was based on traditional ...
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