Floating the scrubber fore and aft. Ten tons of shell and weed were removed Lowering the electrical scrubber from the tender. Current in this case is from one side alone of this steamer. supplied by the tender. It may also be supplied by the ship itself. The complete gear showing the mat carried on chains with insulating cork disks between Details of mat showing outer battens with diagonal brushes to prevent short circuiting. magnets and dumb battens in center., scientific american, 1908-11-07
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