Abstract: A device for measuring the depth and temperature of a liquid stored in a tank is provided. The device includes a hermetically sealed vertically disposed tube having ultrasonic transmitter/receiver devices at either end thereof with a reflector vertically movable in the tube and having a through-hole therein permitting transmission from one end of the tube to the other as well as reflection. A float encircles the tube and moves up and down with the level of liquid in the storage tank. The float and reflector are magnetically interconnected so that the reflector moves up and down with the float.

Abstract: An insulated air pot for hot water and the like has a hinged circular cap on the top of which there are arcuate indicators showing the volume and temperature of the liquid in the pot. The volume indicator comprises an indicator hand coupled with the upper end of a twisted strip which slides in a slot in a float member so that it is rotated as the float member rises or falls. The temperature indicator comprises a thermometer of arcuate shape having a bulb in the upper end of a heat conducting conduit. A ball valve at the top of a discharge pipe closes the pipe except when liquid is being discharged and thereby conserves heat.

Abstract: An underground storage tank is filled with liquid (e.g., gasoline) until the level of the liquid in the tank rises into the fill-pipe leading from the surface of the ground to interior of the tank. A buoyant member is floated on the surface of the liquid in the fill-pipe. The height of the buoyant members and the temperature of the liquid within the tank are monitored over a period of time. Any fall of the buoyant member that is not proportional to any change of temperature of the liquid within the tank indicates a leak in the tank.

Abstract: An accurate measurement of the level of drilling mud in a mud pit is provided using an ultrasonic transducer that includes ambient temperature correction. A cylindrical metal shroud open at the bottom is positioned around the transducer. A series of vent holes are located along the upper area of the shroud to allow the convection of ambient air. A series of Nylon screws extend through the shroud close to the transducer to limit lateral movement of the transducer within the shroud. As the shroud and transducer become heated by sunlight, ambient air is circulated from the surface of the drilling mud upward to the transducer through the space between the transducer and the sidewalls of the shroud and out through the vent holes. The chimney effect thus produced insures that the temperature correction accurately represents the temperature of the ambient air between the drilling mud and transducer.

Abstract: A temperature indicator device, used for continuously monitoring the condition of lubricating oil of motorcycles and recreation vehicles, comprises a temperature sensor stem having a calibrated readout gauge, which gauge is orientable about the stem axis in a cover element of the lubricating oil reservoir.