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A resistive counter is associated with an in-river structure, an example constituting a Crump weir. [1] The resistivity of a fish is lower than that of water. So, as fish cross this barrier, they pass embedded electrodes, and the difference in resistivity disturbs the field established in the vicinity of the electrodes, altering inter-electrode resistance.
Learn about the history, design and uses of trolling motors, self-contained marine propulsion units that include an electric motor, propeller and control system. Find out how trolling motors can be hand-controlled, foot-controlled or wireless, and how they differ from outboard motors.
A fishmonger is someone who sells raw fish and seafood, and may be a wholesaler or a retailer. Learn about the origin, role and culture of fishmongers, as well as the tools they use to prepare and display their products.
Learn about the Thunderbirds machines, a series of futuristic air, land, and sea vehicles that appear in the 1960s film and TV show Thunderbirds. Thunderbird 4 is a space rocket that can travel to the moon and beyond, piloted by Alan Tracy.
eBay is an American online marketplace that allows users to buy and sell various items via auctions or instant sales. Founded in 1995 by Pierre Omidyar, eBay has grown to serve 190 markets worldwide and has faced competition from other platforms such as Amazon and Alibaba.
A herringbone gear is a type of double helical gear that consists of two helical gears of opposite hands side by side. Learn about its advantages, disadvantages, manufacture, history and applications in marine propulsion and automotive industry.
The cat (Felis catus) is a small domesticated carnivorous mammal and the only domesticated species of the family Felidae. It is derived from the African wildcat (Felis silvestris lybica) and has a close relationship with humans as a pet, farm cat, or feral cat.
Brush Electrical Machines is a UK-based manufacturer of electrical generators and motors. It was founded by Charles Francis Brush, who invented the first electric dynamo in 1876, and later became part of the Hawker Siddeley and FKI groups.