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The term "marine canvas" is also used more narrowly to refer specially to boat cover products. When referring to materials "marine canvas" is a catch–all phrase that covers hundreds of materials, for instance: acrylics, PVC coated polyester, silicone treated substrates and many coated meshes suitable for outdoor use.
This is a list of boat builders, for which there is a Wikipedia article. This is a dynamic list and may never be able to satisfy particular standards for completeness. You can help by adding missing items with reliable sources .
Butterworth hatches are not the main access hatches, but are the servicing hatches, and are generally closed with a metal cover plate with a gasket that is fastened to the deck by a number of bolts which stick up from the deck. Holes on the edges of the plate fit over these bolts and the cover is fastened down with nuts or dogs.
Robert MacGregor was a British engineer, who, during the 1920s, concerned over unnecessary losses of North Sea colliers, developed the first steel hatch cover.. The design was simple and consisted of five articulated leaves that stowed neatly at the end of each hatch.
SS Henry Steinbrenner, May 11, 1953, Lake Superior, 17 of 31 crew died, (flooded after the cargo hatch covers were lost during a storm) SS Emperor, June 4, 1947, Lake Superior, 12 of 33 crew died, (ran into rocks at Isle Royale) SS Superior City, August 20, 1920, Lake Superior, 29 of 33 crew died, (collision with freighter Willis L. King)
Six large cargo hatch covers on a capesize bulk carrier ship as she approaches the Egyptian-Japanese Friendship Bridge. A cargo hatch or deck hatch or hatchway is type of door used on ships and boats to cover the opening to the cargo hold or other lower part of the ship. To make the cargo hold waterproof, most cargo holds have cargo hatch.