Abstract: This invention is a fluid flow meter with pulse output proportional to the fluid flow rate. The pulse is tranduced by means of a pick-off sensor from the by-passing of a ball which travels in a toroidal passageway at speed close to that of the velocity of the fluid. The fluid flowing into the device follows a loop-shaped circular passageway while the ball travels in a closed circular passageway. Fluid flow propels the ball to revolve continually at a rate directly proportional to the flow rate of the fluid.

Abstract: This invention is a heating and cooling wall panel that accomplishes heating by radiating to bodies in a space thermal energy from a source of warmed water delivered to the panel at low pressure, and cools bodies in a space by absorbing thermal energy radiated to the panel from those bodies and passing the heat thus gained to a cooled fluid also delivered at low pressure. The heat transfer by this panel is accomplished when only small temperature differentials exist between the fluid and the space owing to the extreme thinness of the radiating-cum-absorbing panel face.