Abstract: A flow meter for measuring the velocity of fluid flow in a conduit is disclosed, characterized in that an electromagnetic sensor probe is mounted within an opening contained in the conduit for generating electrical signals as a function of the velocity of fluid flow. The probe has a debris shedding head portion which protrudes into the interior of the conduit and includes an electromagnet for generating an electromagnetic field in the fluid, the axis of the field extending normal to the direction of fluid flow. The probe further includes a plurality of electrodes arranged beyond the poles of the electromagnet and adjacent the fluid for producing the electrical signals in response to the flow of fluid through the electromagnetic field. Signal processing apparatus is connected with the sensor probe for converting the electrical signals into a flow velocity output signal.

Abstract: A device for controlling the temperature of a bottle, jar or the like is disclosed, characterized in that the desired temperature of the bottle may be selected and maintained by mechanically adjusting the heat transfer surface area of the device. The device includes inner and outer containers arranged in concentrically spaced relation, each of the containers having a vertically arranged tubular wall portion open at its upper end. The inner container is formed from a heat conducting material, and a first fluid medium having a given initial temperature is arranged in the space between the inner and outer containers. The bottle is arranged within the inner container as is a heat energy transfer control device which controls the transfer of heat energy between the bottle and the first fluid medium through the inner container, thereby to control the temperature of the bottle.

Abstract: A fluid flow rate meter is disclosed for measuring the flow of fluid in a partially filled conduit or channel, including an electromagnetic probe adapted for mounting in the conduit below the low water mark thereof to produce a sensed velocity signal, and a liquid height pressure transducer including an air tube having a bubble-producing opening adjacent the probe for generating a liquid height signal that modifies the sensed velocity signal to produce a resultant signal that corresponds with the average velocity of fluid flow, whereby a more accurate measurement of the rate of fluid flow is obtained. The average velocity signal is multiplied with a conduit area signal obtained from the height signal by a function generator circuit which takes into account the maximum diameter of the conduit (or maximum height of the channel). A percent flow signal is modified by a second function generator in accordance with the area of the conduit.

Abstract: Electromagnetic sensing means are disclosed for measuring the velocity of a current of fluid, such as water, characterized by the use of a spherical body containing electromagnetic means including a first coil for establishing a first magnetic field in the fluid in which the spherical body is submerged, and a plurality of pairs of peripherally mounted circumferentially spaced pairs of diametrically arranged electrodes which are contained in a common first plane normal to the axis of the first magnetic field, each electrode of the electrode pair protruding radially outwardly from the outer surface of the spherical body a common distance which is between 0.100 and 0.125 inch per inch of the diameter of the spherical body. In a two-axis embodiment, first and second orthogonally-arranged pairs of diametrically opposed electrodes are provided, together with detecting and indicating means for comparing the electrical signals produced across the electrodes of the electrode pairs, respectively.