u13 - AWOIS 7932

H10224/86 -- OPR-C121-WH-86; WHILE INVESTIGATING ITEM 751, AN AREA WITH NUMEROUS SIDE-SCAN SONAR CONTACT WAS FOUND AND DEVELOPED USING SIDE-SCAN AND ECHO SOUNDER; DIVER INVESTIGATION DETERMINED LIMITS OF SITE, NATURE OF WRECKAGE, AND LOCATION OF THE LEAST DEPTH; SITE WAS ORIENTED NORTHEAST-SOUTHWEST; CONSISTS MOSTLY OF SHIPYARD DEBRIS IN THE FORM OF HEAT EXCHANGERS, BUCKLED DECK PLATING, TWISTED ANGLE IRON, WOODEN RIBS, AND PIPING OF VARIOUS LENGTHS AND SIZES; THE NORTHEAST END OF THE SITE CONSISTED OF A BARGE LYING IN A NORTHWEST-SOUTHEAST DIRECTION WITH THE BOW OF THE BARGE DEFINING THE SOUTHEAST WALL OF THE SITE; THE NORTHWEST END OF THE BARGE, THE STERN, WAS COVERED WITH METAL DEBRIS, HAWSER LINES, AND TRAWLER NETTING; DIVERS CONCLUDED THAT THIS SITE IS THE WRECK OF A BARGE THAT WAS FILLED WITH SHIPYARD SCRAP IRON AND DEBRIS; PNEUMATIC DEPTH GAUGE LEAST DEPTH OF 50 FT. (ENTERED MSD 4/91)


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steam-powered winch
A steam-powered winch on a schooner barge. Note the various drums for drawing up anchor chain, towing hawsers, etc, and the anchor chains themselves going down through the deck into the chain locker below.

Prior to steam power, the only force available on a sailing ship to perform all the necessary work was the men on board. For some tasks, such as raising the anchor, it might be necessary to yoke the entire crew to a multi-deck manual capstan. On the largest vessels, even with every available man, this might take several hours to complete. With the advent of steam power, a "donkey engine" and a single engineer could do the work of many men, in less time, and these were soon installed in almost all vessels.

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