A cavity antenna having an aperture which may be mounted flush to the gro plane. A chamber positioned above a rectangular resonant cavity allows the antenna to achieve normal bandwidth and normal gain with a very thin cavity depth.

A laser cavity dumper capable of building up energy at a given mode or wavelength while emitting light of a different wavelength is created through use of a Fox interferometer with an electro-optic cell. The Fox interferometer can have either of two configurations. Placement of the electro-optic cell in either of two locations for each of these configurations will either cause the oscillating modes for the laser cavity to scan or undergo discreet shifts of preferred modes. The Fox interferometer...

A laser cavity comprising a gain medium and first and second end mirrors, wherein the laser cavity further comprises a birefringent material and a mirror arranged to fold light propagating within the laser cavity through a predetermined angle, wherein the predetermined angle is selected such that the reflectivity of the fold mirror is polarisation dependent, and the birefringence of the birefringent material co-operates with the polarisation dependent reflectivity of the fold mirror to form a Ly...

A reactor cavity surrounding a reactor coolant inlet or outlet pipe is designed to reduce pressurization of the cavity in the event of a LOCA pipe break therein.

A cavity resonator serves to generate magnetic dipole transitions in a sample, for instance for carrying out electron spin resonance measurements. The natural frequency of the cavity resonator (10) is influenced by a reduction in length of the E flux lines. To this end, conductive areas (20) are arranged at the points where the E flux lines are encountered. This results in an increase of the space factor, related to an unchanged specimen volume, and thus in an improvement of the measuring sensit...

By rounding and/or rendering obtuse at least the vertical angles of the connecting walls in a ceramic cavity which come into contact with a noble metal coating or pad therein, "peel-back" of the noble metal coating or pad is prevented.

Apparatus and method for determining which of a plurality of molds produced a particular bottle and a bottle coded in a manner suitable for identification by the apparatus of the invention. A non-digital identification code is molded into a bottle while it is formed in a mold. As a preferred embodiment, the code is an octal code imposed as a series of protuberances in the bottom of a glass container. The bottle is presented at an identification station, and the image of the identification indici...

A piston (10) containing a cavity (16) is manufactured by forming a box (20; 50; 70; 80). The interior of the box defines the cavity (16). The box ms mounted in a die cavity (26) and the piston is cast around the box. The box is provided with projections (22c; 24c; 52; 58; 73) which enter recesses in the wall of the die cavity and support the box. After removing the piston from the die cavity, the projections are machined off.

A cavity floor that includes a profiled sheet material. The sheet material has support feet that are substantially rigid. The surface of the sheet material extending between the support feet is substantially flexible. The thickness of the sheet material and the mutual spacing of the support feet are selected so that the sheet material is sufficiently rigid to support a person and sufficiently flexible to adapt to an uneven floor surface. The deformable surface enables automatic vertical adjustme...

A portable, self-contained, light-weight, compact and explosion-proof device, that is readily dismantable and transportable by automobile or aircraft, for inspecting the ignition surfaces of a solid propellant rocket motor can be introduced into the motor from the aft end thereof with or without the nozzle in place and is characterized in that a light source, reflecting means and viewing means are so arranged therein as to allow an operator to observe from outside the motor the condition of the ...