Matches in DBpedia 2016-04 for { <http://books.google.com/books?vid=ISBN978-0-08-044910-4> ?p ?o }
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- books?vid=ISBN978-0-08-044910-4 date "2009-07-16".
- books?vid=ISBN978-0-08-044910-4 isCitedBy Herbert_Grove_Dorsey.
- books?vid=ISBN978-0-08-044910-4 isbn "978-0-08-044910-4".
- books?vid=ISBN978-0-08-044910-4 last "Elsevier".
- books?vid=ISBN978-0-08-044910-4 publisher "Elsevier".
- books?vid=ISBN978-0-08-044910-4 quote "In 1925, the first fathometer, known as the "312 fathometer," was developed by the Submarine Signal Company of Boston, Mass. This system allowed an operator to determine depth values by correlating the echo heard in his headset while noting the reading on a continuous-rotating flashing white-light circular depth scale. This system was more accurate and, unlike the previous system, could be operated while the vessel was underway. The first precision instrument deemed accurate enough for hydrographic work was the Dorsey fathometer #1, developed in 1933 and deployed on the Lydonia in 1934. This was truly a revolutionary system for its time as it incorporated the transmitter and receiver into one seawater-tolerant hull mounted unit called a transceiver, used supersonic operating frequency of 17 kHz, incorporated a mechanism for vibration dampening, had an operating range of from 3 to 900 feet".
- books?vid=ISBN978-0-08-044910-4 ref "harv".
- books?vid=ISBN978-0-08-044910-4 title "International Encyclopedia of Human Geography: A 12-Volume Set".
- books?vid=ISBN978-0-08-044910-4 url "http://books.google.com/books?id=8isCe3cFYa8C&pg=PT7141".