Abstract: A system (10) for conducting welding adjacent flammable materials (12) on a platform (11) is disclosed having a chamber (13) defining an interior space (16). The system also includes a welding apparatus (48) operable within the interior space. A sensor (54) is provided for sensing the presence of combustible gas within the interior space above a pre-selected level and generating a signal. An exterior sensor (57) is provided for sensing the presence of combustible gas outside the interior space above a pre-selected level and generating a signal. A controller (66) is in communication with the welding apparatus, the sensor, and the exterior sensor to control the operations of the welding apparatus in response to signals received from the sensor.

Abstract: The invention provides a method and apparatus for obtaining a selectable contrast image in an X-ray exposure. The method comprises applying a controlled high voltage to an X-ray tube in response to a controlled invertor-generated voltage; generating the controlled invertor-generated voltage; driving the invertor in response to a KV control signal; comparing a KV feedback signal with a KV reference signal for developing said KV control signal, and selecting any of a plurality of variable level reference signals as the KV reference signal. The apparatus comprises means for carrying out the foregoing method.

Abstract: A container for solid fertilizer is provided, the container being inserted into a sprinkler line system. The container provides a screen to hold the fertilizer and permits water to permeate therethrough. The screen and fertilizer are secured within a screen holder having continuous or perforated side walls, depending on the type of solid fertilizer to be used, and a gapped bottom support for the screen.Water from the sprinkler is fed into the container and is pressurized through the screen and dissolves the fertilizer. The rate of solubilization depends on the water flow, the type and solubility of the fertilizer, and the size of the perforations in the screen and gaps in the screen holder.

Abstract: A fertilizer applicator for solid fertilizer is provided, and is inserted into a sprinkler line system. The applicator comprises a container component which encloses and suspends a fertilizer holder component and spaces the two conponents to define a water pressurization chamber therebetween. Water is fed from the container through the pressurization chamber and into the bottom of the fertilizer container where it dissolves some of the fertilizer and forms a leached, concentrated solution. This leached solution rises through the fertilizer and into overflow tubes where it drains downwardly through the bottom of the fertilizer holder. The concentrated solution is then diluted with water draining from the bottom of the water pressurization chamber, and the diluted solution of fertilizer is passed into the sprinkler system for application to vegetation. The applicator has no moving parts, and has a simplified design.

Abstract: A container for solid fertilizer is provided, the container being inserted into a sprinkler line system. The container provides a screen to hold the fertilizer and permits water to permeate therethrough. The screen and fertilizer are secured within a screen holder having continuous or perforated side walls, depending on the type of solid fertilizer to be used, and a gapped bottom support for the screen.Water from the sprinkler is fed into the container and is pressurized through the screen and dissolves the fertilizer. The rate of solubilization depends on the water flow, the type and solubility of the fertilizer, and the size of the perforations in the screen and gaps in the screen holder.

Abstract: A fluoroscopic table having a table top for supporting a patient for irradiation by X-rays generated by a source located beneath the table top, which X-rays are directed through the table top and patient to a receptor located above the patient, the receptor comprising a heavy image intensifier and spot filming device, for example, movable longitudinally and transversely of the table, and the X-ray source comprising a heavy X-ray generator and collimator which are movable as a unit longitudinally and transversely of the table for constant alignment with the receptor, the mountings for the receptor and source being separate from one another and the movements thereof being individually controlled by servo mechanisms whereby precise alignment is automatically achieved and maintained.

Abstract: A fluoroscopic table having an electrically operated motor for moving the heavy fluoroscopic staging in a direction longitudinally of the table, the motor being controlled by a drive circuit which produces a constant output torque at the motor shaft which is of a predetermined value slightly less than the effort necessary to automatically initiate motion of the staging whereby an operator may apply only a slight amount of effort to cause such motion and will retain a natural "feel" of control.

Abstract: An X-ray radiographic or fluoroscopic table which includes as a part thereof a bucky including a frame containing a removable cassette-supporting tray, the bucky being movable in the long direction of the table and having a front opening for slidably receiving the tray, the bucky further carrying switch means operable in conjunction with switch-operating means on the tray, the switch being operable, when the tray is located in either cassette-loading or in filming position, to activate means for rendering the bucky immovable, which means is inactivated to allow the bucky to be adjusted when the tray is located at a midpoint between those positions.

Abstract: An automatic control system is provided for regulating the emission of an X-ray tube of the type which is activated by the heating of a cathode filament by passing current through the filament, and which emits X-ray radiation systematically in accordance with the amount of tube current flowing between the anode and cathode of the tube, with a relatively high voltage being applied between the anode and cathode. Current is passed through the filament and a tube current sensor is coupled to the X-ray tube for developing a tube current signal representative of the magnitude of the current flowing between the cathode and anode of the X-ray tube. Coupled to the current sensing circuit and responsive to the tube current signal is a circuit for generating a filament current control signal.

Abstract: An X-ray apparatus with improved housing of components comprises a pedestal with an X-ray table thereon, and power components of the apparatus housed within the pedestal. Those power components comprise the high voltage X-ray transformer and the power control for the same. An operator's control unit is remote from the pedestal and is connected to components within the pedestal by a low voltage cable. The control unit may be mounted on a table, wall, or other suitable location. The control unit contains the components that the X-ray technician needs to select the factors that determine the X-ray exposure.