Abstract: A system of vertical louvers for installation on a cooling tower having fixed horizontal slats. The louvers are mounted side by side for opening and closing movement about vertical axes. When closed, the louvers block the air spaces between the slats. When open or partially open, the air spaces are exposed to varying degrees in order to provide control of the pattern of air flow through the cooling tower. The louvers are mounted between concrete or wood beams of the cooling tower by a steam of angle brackets, pins or bolts.

Abstract: A modular panel system for use in constructing temporary buildings of the type that can be disassembled and transported in disassembled form for erection at a new site. Each panel includes a ribbed sheet of steel secured to a rectangular frame formed by three steel angle members and a channel. The ribs on each panel provide ridges on the outwardly facing surface of the sheet and corresponding grooves on the inwardly facing surface. The panels are bolted together with one rib of each panel closely overlapping one rib of the adjacent panel to provide watertight joints between all panels on the walls and roof of the building. The construction of the panels permits them to be compactly stacked for storage and transport.

Abstract: A solid state amplifier includes at least one junction field effect transistor and an impedance network coupled between a signal input terminal of the amplifier and a gate terminal of the transistor. The network includes a p-n junction device having a region of conductivity opposite to that of the gate of the transistor coupled to the gate terminal, the p-n junction being shunted by a resistor coupled in parallel therewith. The network minimizes signal distortion which would otherwise be introduced to the signal output of the amplifier when an inductive load is present in the output circuit of the amplifier.