File:Americana 1920 Deep-Sea Exploration - dredging equipment.jpg

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Description
English: Chart of dredging equipment used by the deep-sea research ship U.S.S. Albatross.
Date published 1920
Source The Encyclopedia Americana, v. 8, 1920, p. 578.
Author Unknown photographer
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(Reusing this file)
Public domain
This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929.
Public domain works must be out of copyright in both the United States and in the source country of the work in order to be hosted on the Commons. If the work is not a U.S. work, the file must have an additional copyright tag indicating the copyright status in the source country.
Note: This tag should not be used for sound recordings.PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:Americana_1920_Deep-Sea_Exploration_-_dredging_equipment.jpg

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Fig.  1.—Showing net in position for lowering and towing: a, Tow line; b, Tripping arm; c, Tripping ring; d, Opening slings; e, Closing slings; f, Folding net ring; g, Closing weight; h, Closing messenger. (See also Fig. 3.)
Fig.  2.—Showing net closed for heaving in.
Fig.  3.—Closing messenger.
Fig.  4.—Showing heavy tripping arm used on steamer Albatross, with 60-pound sounding shot attached as sinker for proper strain on wire tow line in deep-sea work.
i. Common sounding shot - 60 pounds.

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current14:37, 29 March 2013Thumbnail for version as of 14:37, 29 March 2013601 × 1,071 (120 KB)Bob Burkhardt (talk | contribs){{Information |Description={{en|Chart of dredging equipment used by the deep-sea research ship U.S.S. ''Albatross''.}} |Source=''The Encyclopedia Americana'', v. 8, 1920, p. 578. |Date=published 1920 |Author=unknown photographer |Permission={{PD-1923}}...

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