Abstract: A magnetic grounding clamp for portable yet secure connection of a welder grounding lead to any grounding body including irregular-shaped objects such as pipes and metal cylinders. The grounding electrode generally comprises conductive body having a protruding elongate neck, opposing-protruding legs, and a pivoting foot assembly having a disk-like magnet attached distally at the end of each leg. A length-adjustable tungsten grounding electrode protrudes downward from the end of the elongate neck. The body has a tail section with an adjustable spacer protruding therefrom. The spacer see-saws the body about the foot assemblies to maintain the grounding electrode in direct contact with whatever earth structure the cupped magnets are affixed to, thereby ensuring a firm ground contact and reliable ground path for the welder grounding lead.

Abstract: A magnetic grounding clamp for portable yet secure connection of a welder grounding lead to any grounding body including irregular-shaped objects such as pipes and metal cylinders. The grounding electrode generally comprises conductive body having a protruding elongate neck, opposing-protruding legs, and a pivoting foot assembly having a disk-like magnet attached distally at the end of each leg. A length-adjustable tungsten grounding electrode protrudes downward from the end of the elongate neck. The body has a tail section with an adjustable spacer protruding therefrom. The spacer see-saws the body about the foot assemblies to maintain the grounding electrode in direct contact with whatever earth structure the cupped magnets are affixed to, thereby ensuring a firm ground contact and reliable ground path for the welder grounding lead.

Abstract: A continuous feeding process is provided in a flow-through container wherein the input oxygen content of the water flow is measured and a signal is sent to a system processor. The system processor controls the output of a feeder which supplies a continuous controlled amount of feed to the fish, with the amount of the feed being directly related to the oxygen content of the water. The output oxygen content is also measured and a signal is sent to the system processor. In response to the input and output signals, oxygen is controllably supplied to the input side of the flow-through container. A photosensor is also connected to the processor so as to limit the feeding process to daylight hours.

Abstract: A method and apparatus for oxygenating water in an aquaculture system without adding nitrogen or other possibly harmful gases. A columnar housing floats in the aquaculture pond on a float ring with a submersible pump immersed in the pond. The pump draws in water and pumps it to the top of an oxygenation chamber which is packed with a surface expansion medium. The oxygenation chamber is filled with oxygen which is transferred to the water falling through the chamber. The oxygenated water is returned to the pond through outlet ports at the bottom of the oxygenation chamber. A cover on the column can be removed at times to allow infiltration of air for aeration of the water.