Albert Lauris Thuras

Albert Lauris Thuras ( 1888 - September 7, 1945 ) was an American oceanographer and developer.

He studied at the University of Minnesota and graduated in Harvard .

From 1916 he served at the International Ice Patrol on Davis Strait as a scientific observer and 1918–1920 as an oceanographer. During these years he made studies of the changed positions of the Gulf Stream and the Labrador Stream between April and July, which were published in the bulletin of the United States Coast Guard .

At the Bureau of Standards he was responsible for perfecting instruments for certain oceanographic work. Among other things, he developed a hydrometric method for determining the salinity of seawater.

As a research engineer he worked together with Edward C. Wente at Western Electric and from 1925 at Bell Telephone Laboratories . In 1925 she developed the driver Western Electric 555-W for a 12- inch - Horn speaker whose mathematics in moving-coil Telephone receiver and Microphones described. In the frequency range of the human voice, it had an efficiency of 25% (today around 1%) and was able to fill a cinema hall with a 10-watt amplifier. Don Juan (premiere: August 6, 1926) and The Jazz Singer then put an end to the silent film. In 1930 he developed the bass reflex principle (U.S. Patent No. 1,869,178 of August 15, 1930; issued July 26, 1932). On March 28, 1933, he was granted U.S. Patent No. 2,037,185 for his Sound Translating Device .

In 1941, because of his experience in marine techniques, he was sent to the National Defense Laboratories at Fort Trumbull in New London (Connecticut) to develop underwater search equipment. After that he lived in New York. He was a member of the Explorers Club .

Individual evidence

1. ^ The Explorers journal, 1937, 1943
2. ↑ Thuras, op. L. - 1915 Report of Physical Observations. (No longer available online.) In: www.forgottenbooks.com. Archived from the original on February 20, 2015 ; accessed on February 20, 2015 . 
3. ^ Moving-Coil Telephone Receivers and Microphones ; at scitation.aip.org  ( page no longer available , search in web archives )