Abstract: The light output of a fluorescent lamp is improved under cold temperature operating conditions by enclosing the envelope in a jacket of light-transmitting plastic material that has a plurality of air pockets or bubbles formed therein. The pockets of entrapped air collectively function as a thermal blanket for the envelope which conserves the heat produced by the lamp during operation without obstructing the generated light rays. The "thermo-bubble" jacket is preferably fabricated from flexible two-ply plastic so that it can also serve as a lightweight protective component for the lamp when it is packed with other jacketed lamps in a shipping container.

Abstract: The invention relates to a low-pressure sodium vapor discharge lamp provided with a U-shaped discharge tube which is enveloped by an outer bulb. The bend of that discharge tube is supported by means of a metal element relative to the outer bulb.In accordance with the invention the bend of the discharge tube is partly passed through a hole in the metal element and bears against two fingers which are part of the metal element.

Abstract: A lamp comprises one or more light sources encapsulated as by casting in an inner relatively soft impact absorbing transparent material, such as polymerized silicone rubber, and in an outer relatively hard impact resistant transparent material, such as acrylic or glass. The lamp which may be used alone, or in combination with other protective housing components for specialized purposes, such as runway or highway lighting, is impact resistant, pressure resistant, completely sealed, waterproof, electrically insulated, and explosion proof.

Abstract: A device for generating a high level electron current pulse includes a housing whose interior can be evacuated from outside the housing, a cathode electrode located in the housing and arranged to be connected to a high voltage generator, an anode electrode disposed in the housing in facing relation to the cathode electrode, the anode electrode having an opening aligned with the electron emission portion of the cathode electrode and being provided with a grid which covers this opening and which presents a high electron transmission level, the grid defining a plane with one face of the anode electrode, and the walls of the housing defining an annular space filled with a solution whose resistivity is a function of its concentration to give these walls a variable electrical resistance which can be adjusted to match the impedance of the cathode electrode - anode electrode system to that of the high voltage generator.

Abstract: An encapsulated lamp assembly for use under submerged conditions and in environments where the lamp may be subjected to extreme temperature variations and corrosive conditions, which includes a bulb and base unit with single or multiple filaments and leads cooperating with the filament busses. The leads are typically soldered to the busses, and the entire unit is sprayed, brushed or dipped in a silicone composition to provide a thin film of protective silicone material on the outside and on the junction between the leads and the busses. A rubber boot is positioned on the leads to insure a thick coating on the lead-bus junctions, and the lamp assembly can be fitted to any conventional bracket mechanism.

Abstract: 2. In a reflex klystron tube apparatus, means for forming a beam of electrons, a resonator means positioned along the beam path, said resonator means being apertured for the passage of the beam of electrons therethrough for electromagnetic coupling to the beam, reflector means disposed on the side of the resonator remote from said means for forming the beam of electrons, said reflector means serving for reflecting the electrons incident upon the reflecting fields of said reflector means back through said resonator means substantially along the incident beam path, said means for reflecting the electrons formed and arranged to impart a slight transverse velocity to the electrons whereby they are caused to move transversely of and out of the beam in a small number of beam transits thereby minimizing unwanted amplitude and power modulation in the output signal of the tube apparatus.

Abstract: An elongated discharge lamp which is particularly intended for use in photo-chemical reaction processes. The discharge tube of the lamp is supported at its ends by two end mountings, one of which carries the input terminals for the lamp. A conductor extending along the length of the discharge tube joins one of the terminals to the electrode at the remote end of the tube, and the tube and conductor are separately enclosed in respective transparent tubular envelopes sealed to the end mountings at their ends.A liquid-cooling jacket is provided, cooling liquid being circulated therethrough by means of a tube of transparent material supported in the end mountings.