Abstract: A method of manufacturing a low-pressure arc discharge lamp formed by interconnecting two or more adjacent glass discharge tubes. A hermetically sealed common passageway between the two adjacent tubes is formed by positioning the tubes in a contiguous relationship to define at least one common location of contact. Heating a preselected area of the internal surface of each of the tubes relative to the common location of contact to soften the glass to the extent a common passageway is defined between the tubes. Thereafter, separating the tubes a predetermined distance while the glass is in a softened state to stretch the softened glass, thereby extending the common passageway between the tubes. The technique may be applied to multiple tube assemblies precoated with a luminescent layer by alternating the end of the tube at which the passageway is formed. Once the tubes are joined, they may be processed by current manufacturing techniques to produce a low-pressure arc discharge lamp.

Abstract: An arc tube has a metal end cap at its end, electrically connected to an electrode in the arc tube. The end cap has a bowed spring contact fastened thereto which is the support means and the electrical connection means for the arc tube when it is inserted into a socket.

Abstract: A flash assembly which uses an elongated arc discharge flash tube positioned within a reflector. A trigger bar member fits within a slot of the reflector and is located adjacent the tube. The reflector, trigger bar, and the contacts which electrically connect the electrodes projecting from the tube to a suitable power source are mounted within an insulative base. The invention is particularly suited for use within a camera assembly.

Abstract: A high wattage incandescent lamp which includes a two-part ceramic base. Within the base is a barrier section which separates the base's cavity from the respective pin recesses. The structure permits utilization of hollow pins which include a flattened end portion for being retained within the base. The lamp is especially suited for studio, theatre, and television applications.

Abstract: A retrofit assembly for replacing a lens-containing lamp in an overhead projector. The assembly comprises a quartz-halogen lamp, having an internal reflector and an enlarged base removably mounted in the projector, and a lens holding bracket removably mounted in the projector in alignment with the lamp. The bracket is resiliently pivoted toward the lamp and has a tab for striking the lamp base to retain the lens at a predetermined distance from the lamp.