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- Nov 19, 2002
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- 4,674
Attached is a file that details the design of light traps I've just made up; the depth of the cylinder is 2 metres, 1 metre for the column and 1 metre for the funnel (for some reason these measurements did not come out on the file [cut/paste from word document into jpg format]).
The netting material is 335 micron (0.335mm), with 1 stitched seam lengthwise in the cylinder, 2 x strengthening canvas seams; the mesh has holes cut into it into which the softdrink bottletops are placed (basically welded with a glue gun); the funnel is a separate piece of material stitched to the cylinder, again with a single longitudinal seam.
The netting is afixed to the marine ply disc by ~ 75 cable ties, each tied through an eyelet spaced every 20-or-so mm around the netting, with 2 small holes drilled into the plywood for the cable tie to go in, through the eye and out again, tied off at the top. I should have a few more pics to explain this as words are rather clumsy.
Am open to any comment/improvement; fluorescent lighting in the bag would certainly be an improvement ... and I'm working on waterproof housings for cheap fluoro tubes.
To keep these things floating subsurface (only just) you have series of ropes and buoys, the entire system anchored to teh seafloor with heavy weights (so as they don't drift away into never-never land in the current. Also, when deploying these things offshore, at night, ensure that you have some sort of strobe or light stick so that you can relocate them.
Must get back to things here .....
The netting material is 335 micron (0.335mm), with 1 stitched seam lengthwise in the cylinder, 2 x strengthening canvas seams; the mesh has holes cut into it into which the softdrink bottletops are placed (basically welded with a glue gun); the funnel is a separate piece of material stitched to the cylinder, again with a single longitudinal seam.
The netting is afixed to the marine ply disc by ~ 75 cable ties, each tied through an eyelet spaced every 20-or-so mm around the netting, with 2 small holes drilled into the plywood for the cable tie to go in, through the eye and out again, tied off at the top. I should have a few more pics to explain this as words are rather clumsy.
Am open to any comment/improvement; fluorescent lighting in the bag would certainly be an improvement ... and I'm working on waterproof housings for cheap fluoro tubes.
To keep these things floating subsurface (only just) you have series of ropes and buoys, the entire system anchored to teh seafloor with heavy weights (so as they don't drift away into never-never land in the current. Also, when deploying these things offshore, at night, ensure that you have some sort of strobe or light stick so that you can relocate them.
Must get back to things here .....