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Kevlar (para-aramid) [2] is a strong, heat-resistant synthetic fiber, related to other aramids such as Nomex and Technora.Developed by Stephanie Kwolek at DuPont in 1965, [3] [2] [4] the high-strength material was first used commercially in the early 1970s as a replacement for steel in racing tires.
BoPET film was developed in the mid-1950s, [6] [7] originally by DuPont, [6] Imperial Chemical Industries (ICI), and Hoechst. In 1953 Buckminster Fuller used Mylar as a skin for a geodesic dome, which he built with students at the University of Oregon. [8] In 1955 Eastman Kodak used Mylar as a support for photographic film and called it "ESTAR ...
The Universal Dictionary of Violin & Bow Makers is a widely cited reference work providing information on approximately 9,000 violin makers. The work is based on the extensive notes of violinist and composer William Henley (1874-1957) .
Yost may be more widely known for his Yost Violin System, a myriad of method books for the violin, which focus on building basic technique to solidify one's playing. Who's Who in America asserted he had made "revolutionary discoveries" with his publication of the Yost System. [4] Some of his books include: Studies in Pizzicato and Harmonics
Some aspects of violin playing in his day can be seen: the lightweight, concave bow and the absence of any chin rest or shoulder rest. Versuch einer gründlichen Violinschule ( A Treatise on the Fundamental Principles of Violin Playing ) is a textbook for instruction in the violin , published by Leopold Mozart in 1756.
By 1936 improved DuPont process control produced batches conforming to published reloading data rather than requiring different charge specifications for each batch; [11] and those propellants have remained in production. Non-conforming batches were used to load commercial and military cartridges following traditional testing procedures.
In the final section, Schumann references the main theme from her husband Robert Schumann's first violin sonata. [6] The second romance is more syncopated, with many embellishments. It is sometimes considered as representative of all three, with energetic leaps and arpeggios, followed by a second theme and then a return to the first theme. [ 7 ]
The four short movements of the sonatina each exhibit a simple and clear, formal structure (hence the diminutive, cf. sonata).They all contain themes, which, like those already found in his other American chamber works (the String Quartet in F and the String Quintet in E ♭), owe their inspiration to Indian melodies and Negro spirituals, which are characterized by pentatonic scales and ...