Abstract:
A high voltage lightning arrester including a hollow insulating housing, a plurality of nonlinear resistance elements and insulating means alternately arranged in a main column for carrying a compressive load thereon, and a plurality of spark gap assemblies mounted on the insulating means adjacent the main column, alternate ones of the insulating means extended in general parallelism and at an angle relative to the remainder thereof so that the spark gap assemblies are nonloaded and arranged in two auxiliary columns adjacent the main column with successive assemblies disposed in different ones of the auxiliary columns.
Abstract:
A large-size display unit in which dark lines between individual display elements of which the overall unit is composed are eliminated and connections to the display elements are simplified. The inventive display unit includes a plurality of display element boards arranged in a matrix, each board having a plurality of the display elements mounted thereon. Each display element board has end portions bent backwardly in the vertical and horizontal directions of the board. Signal connectors are mounted on the backwardly bent end portions.
Abstract:
Apparatus for the exchange of emission sources of a particle accelerator located in an accelerator vessel filled with a gaseous insulating medium, comprising a gastight source-exchange chamber (3) which is connected by means of a line (26) that can be closed by an exchange valve (8) to the accelerator vessel (17), the said chamber (3) being provided on the inside with a movable exchange member (4 and 5, respectively) having at least one hole (41 and 51, respectively) and at least two holders (43, 44 and 53, 54, respectively) for the emission sources (6a, 6b) to be exchanged, one or more lead-through rods (1) for the transfer of an emission source from the accelerator vessel (17) to the exchange chamber (3) or from the exchange chamber (3) to the accelerator vessel (17), as well as means for placing the movable exchange member (4 and 5, respectively) in the desired position relative to the exchange valve (8).
Abstract:
A single-ended low-pressure discharge lamp, such as a fluorescent lamp, isade by providing an inner glass base structure which has a depending portion (2) extending towards the base (14) of the lamp, and an upper flange or rim portion (3) to which the bulb (10) is melted-on as a last step. Two U-shaped tubes (5, 5') are melted-in into an oval deformed region of the depending projecting end portion (2), a pre-heatable electrode (12, 12') being also located within the end region (8, 8a) of the U-shaped tubes, so that, in one working step, after deformation of the glass U-shaped tubes and the glass inner base structure, a press operation will seal together the electrodes within the ends of the U-shaped tubes, the glass of the U-shaped tubes and the inner base structure. The glass of the U-shaped tubes is coated with a phosphor, resulting in a long discharge path, through both of the U-shaped tubes, permitting direct replacement of screw-type based incandescent lamps by the thus formed fluorescent unit, after placing a bulb over the U-shaped tube and attachment to the rim, and introducing a fill including mercury. The axially depending end portion, being generally oval in cross section, leaves space laterally of the elongated sides of the oval between a circular base for positioning, for example, of starter and ballast elements.
Abstract:
An ionization chamber comprises a plurality of cylindrical electrodes which are coaxially arranged, and a casing which holds the cylindrical electrodes in it under the condition allowing the axial shifting of the edges of the cylindrical electrodes but preventing the radial shifting of the cylindrical electrodes whereby the slight relative deviation of parts for the ionization chamber can be minimized during use at high temperature or during a severe thermal cycle.
Abstract:
In a spark gap device a number of arc-resistant insulating elements are stacked in spaced relationship to form spaces between adjacent insulating elements with each element having a through-hole. At least two metallic electrodes are sandwiched between the respective surfaces of adjacent insulating elements in spaced relation to form a spark-over gap therebetween. Each electrode includes a recessed portion and the recessed portions of aligned electrodes on respective opposite sides of an insulating element extend through each of the through-holes in contacting relationship. The insulating elements each include at least one elevation which projects snugly into the recessed portion of an associated electrode.
Abstract:
An electron-beam tube for a scanning electron microscope employs the use of a TF built-up field emission cathode which can be operated from preferably the 100 plane in a substantially continuous mode to provide a stable electron beam having high current density, high resolution, and very high electron optical brightness from a source of very small proportions. The tube, which comprises an evacuated envelope having chambers of different vacuums, is designed to facilitate either quickchange cathode replacement or attendance to the specimen with minimum loss of operating time since the vacuum of the entire tube need not be released. Also, the chamber containing the field emission cathode can be separable from the tube to allow replacement by a new preprocessed cathode in a pre-evacuated chamber. In this case, the mounting means includes a device for puncturing a seal in the cathode chamber to allow the electron beam to pass therethrough.
Abstract:
A support wire, having a bend near one end, is inserted into the coiled leg of a tungsten filament having a coiled body. The coiled leg is flexible enough to permit complete insertion of the support wire therein and to adapt the shape of the leg to that of the wire. The filament and wire assembly is then heat treated to modify the tungsten microstructure and stabilize the filament.
Abstract:
A cathode which allows simple and easy variance in the amount of emission and is constructed of a minimum number of different parts comprises first and second generally concentric cylinders of different diameters such that the cylinders have a space therebetween, which space may receive a heating unit therein. Each of the first and second cylinders have radially extending overlapping flanges joined to each other and one of the cylinders has a lower flange generally below and generally parallel to the upper flanges. At least three hollow tubular emission carriers are positioned between the upper and lower flanges and evenly distributed around the cylinders. The method of making the cathode and particularly the emission carriers comprises the steps of applying a thick layer of tungsten suspended in a liquid coating to the outer surface of a form, pre-sintering the coating to rigidify it, removing the rigidified coating from the form and finally sintering the coating to form a shell for the tubular emission carrier. Upper and lower plugs close opposite ends of the shell whereby it serves as a container or carrier for the cathode emission material. Three or more of the emission material carriers are inserted into aligned holes in flanges of a cylindrically shaped support unit. A cylindrically shaped member of a thin or foil material is connected to the support unit to the dispenser cathode to the tube envelope.
Abstract:
A sealed beam arc lamp is disclosed wherein the lamp exterior is at a single electrical potential. The non-window portion of the lamp exterior can be of high strength metal alloy. Electrical insulation is provided by a thermally conductive ceramic cylinder internal to the lamp and disposed so as to avoid tensile stresses, and by a sealed labyrinthine passage defined by a removable socket.