Science Source ftp Apr 2015

EN_01170126_0683

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caption

Peter Cooper Hewitt (May 5, 1861 - August 25, 1921) was an American electrical engineer and inventor. In 1902 Hewitt developed the first mercury arc rectifier, which was an efficient way of converting alternating current power to direct current for use in electric railways, industry, and high-voltage direct current (HVDC) power transmission. In 1907 he developed and tested an early hydrofoil. His interest in aeronautics culminated in the construction of an early helicopter in 1918. He died in 1921 at the age of 60.

headline Science Source ftp Apr 2015

created date 2015-04-07

credit East News

source Science Source

byline Science Source

original transmission reference BV6877

weight 2,25MB

size 28cm x 38cm by 300dpi

keywords - Show

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