Abstract: There is disclosed saw mill apparatus for cutting root end defects from lumber pieces and cutting such pieces to desired sizes including a generally conventional scanner for recording detailed contour data for each piece as it is moved by a plurality of chain belt conveyors transverse to its longitudinal dimension; the scanner is followed by a root end trim saw unit extending over the root end edge of such conveyors including a motor driven rotating circular saw blade articulated to move down into or up out of the path of lumber pieces and also slidably mounted to be moved over a range of about 24 inches in one half inch increments thereby to cut away a defective portion of a lumber piece identified by the scanner and a conventional mill computer; following the end trimming saw unit is an even ending apparatus with generally conventional ending rolls to transport lumber pieces lengthwise as necessary to butt the root end against a guide fence.

Abstract: Pressurized impure hydrogen gas from a hydrogen generator, bottled hydrogen, or other source is fed to a separate palladium purifier unit having an ultrapure hydrogen output for analytical use, and the like. A plurality of palladium-silver tubes are inserted into a jacket tube to form a tube assembly which is coiled around a heated block. The jacket tube receives the impure hydrogen and the palladium-silver tubes pass pure hydrogen which is transferred to an outlet for use, with the gas impurities being discharged at a vent end of the jacket tube.

Abstract: A control system is provided to control the liquid level in the pressure vessel of a hydrogen generator by means of three electrical probes which extend into the vessel and are electrically connected through an amplifier and switching circuit to a liquid supply pump, a solenoid valve on the hydrogen removal line and a generator power supply.

Abstract: Pressurized impure hydrogen gas from a hydrogen generator, bottled hydrogen, or other source is fed to a separate palladium purifier unit having an ultrapure hydrogen output for analytical use, and the like. A palladium-silver tube is inserted into a jacket tube to form a tube assembly which is coiled around a heated block. The jacket tube receives the impure hydrogen and the palladium-silver tube passes pure hydrogen which is transferred to an outlet for use with the gas impurities being discharged at a vent end of the jacket tube.

Abstract: The pressure vessel of a hydrogen generator is provided with closely-spaced cylindrical screen electrodes and a dielectric coating on the vessel's internal surfaces in order to improve generator efficiency and life.