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The Fraser spiral illusion is an optical illusion that was first described by the British psychologist Sir James Fraser (1863–1936) in 1908. [1] The illusion is also known as the false spiral, or by its original name, the twisted cord illusion. The overlapping black arc segments appear to form a spiral; however, the arcs are a series of ...
The wire pairs are referenced directly by their color combination, or by the pair number. For example, pair 9 is also called the red-brown pair. In technical tabulations, the colors are often suitably abbreviated. Violet is the standard name in the telecommunications and electronics industry, but it is sometimes referred to as purple.
96-button Stradella bass layout on an accordion. C is in the middle of the root note row. The Stradella Bass System (sometimes called standard bass) is a buttonboard layout equipped on the bass side of many accordions, which uses columns of buttons arranged in a circle of fifths; this places the principal major chords of a key (I, IV and V) in three adjacent columns.
The first organ produced in the deeper Model B cabinet, to accommodate the chorus generator [7] B-A. 1938 [8] Model B-C style organ with built-in player organ mechanism [9] (possibly Duo-Art ), custom built by Aeolian-Skinner. [10] BV. 1946–1949 [6] Same as Model B-C but with the Hammond Vibrato and Vibrato Chorus.
Twisted pair cabling is a type of communications cable in which two conductors of a single circuit are twisted together for the purposes of improving electromagnetic compatibility. Compared to a single conductor or an untwisted balanced pair , a twisted pair reduces electromagnetic radiation from the pair and crosstalk between neighbouring ...
A free-bass system is a system of left-hand bass buttons on an accordion, arranged to give the performer greater ability to play melodies with the left-hand and form one's own chords. The left-hand buttonboard consists of single-note buttons with a range of three octaves or more, in contrast to the standard Stradella bass system, which offers a ...
You are free: to share – to copy, distribute and transmit the work; to remix – to adapt the work; Under the following conditions: attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses ...
Ply-split braiding is a technique where one twisted cord ("splitter") passes through another twisted cord or cords splitting the plies of the latter cords ("splittee" cords). This is unlike weaving or many forms of braiding where cloth is formed by threads interlacing in an over-under sequence. Pattern is formed by cord color, and splitting ...