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Ludwig Blattner, also known as Louis Blattner, [2] was a pioneer of early magnetic sound recording, licensing a steel wire-based design from German inventor Dr. Kurt Stille, [citation needed] and enhancing it to use steel tape instead of wire, thereby creating an early form of tape recorder. This device was marketed as the Blattnerphone. [3]
For common tape measurements, the tape used is a steel tape with coefficient of thermal expansion C equal to 0.000,011,6 units per unit length per degree Celsius change. This means that the tape changes length by 1.16 mm per 10 m tape per 10 °C change from the standard temperature of the tape.
Recording onto a metal tape requires special high-flux magnetic heads and high-current amplifiers to drive them. [19] [79] Typical metal tape is characterized by remanence of 3000–3500 G and coercivity of 1100 Oe, thus its bias flux is set at 250% of Type I level.
A tape measure or measuring tape is a long, flexible ruler used to measure length or distance. [1] It usually consists of a ribbon of cloth, plastic, fibreglass, or metal strip with linear measurement markings.
Compared to tape recorders, wire recording devices have a high media speed, made necessary because of the use of the solid metal medium. Standard postwar wire recorders use a nominal speed of 24 inches per second (610 mm/s), making a typical one-hour spool of wire 7,200 feet (approx. 2200 m) long.
Marconi-Stille steel tape recorder at BBC studios, London, 1937 In 1924 a German engineer, Kurt Stille, developed the Poulsen wire recorder as a dictating machine. [ 17 ] The following year a fellow German, Louis Blattner , working in Britain, licensed Stille's device and started work on a machine which would instead record on a magnetic steel ...
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