Abstract: A xenon lamp equipped with magnets attached to the outside of the tube of the xenon lamp at the positions of the electrodes so that metal vapor and other volatile matter emitted from the electrodes at the time of glow discharge is attracted onto the inner wall of the tube at the positions of magnets due to the magnetic field of the magnets, whereby blackening and white turbidity on the light-transmitting part of the wall of the xenon lamp are avoided.

Abstract: A carbon arc lamp for use in a light fastness tester. The lamp has an arc glow section, a base located at the top of the arc glow section, a heat radiating means integral with the upper side of the base, a heat collecting means integral with the side of the base facing toward the glow section, and a glass bulb extending from the base around the glow section. The heat produced due to carbon arc discharge in the glow section is collected by the collecting means and radiated to the outside of the lamp by the radiating means aided by the convection of the outside atmosphere to hold the base at a temperature lower than that of the glass bulb so as to eliminate or reduce deposition of ash resulting from the combustion of carbon on the light transmitting glass bulb which is at a higher temperature than the base by virtue of the tendency of the ash to be deposited to different extents, depending upon temperature, to thereby ensure emission of light through the bulb at a substantially constant luminous intensity.

Abstract: An improved light fastness and weather resistance testing apparatus has a lamp housing having a closed bottom and sides and an open top, a specimen rack rotatably mounted for rotation around the outside of the lamp housing, a testing vessel around the lamp housing and having a top with an opening therein over the lamp housing and within which the specimen rack is located, and having an inlet port and an exhaust port and a recirculation conduit for recirculating exhaust gas from the testing vessel, gas circulating means and gas humidifying means between the recirculation conduit and the testing vessel inlet, electrode means suspended in the lamp housing and electrode moving means coupled to the upper electrode of the electrode means for raising and lowering the upper electrode.

Abstract: A support includes a support element having two electrode contact areas for each electrode to be clamped. Each contact area has fixed thereto a conductive carbon plate. A clamping device has a non-conductive clamping surface for clamping each electrode against its respective pair of carbon plates.

Abstract: A carbon electrode includes an elongate body having first and second sections. One section has a diameter substantially greater than the other section, and the two sections are joined by a radially extending annular shoulder.

Abstract: An automatic combustion tester is disclosed. A burner is provided and is movable by a moving means between a first position adjacent a rigidly supported test piece and a second position. The burner is connected by a first conduit to a lateral tube which is, in turn, connected to a gas bomb by a coupling means. A flame timer is used for controlling the time during which a test piece is exposed to flames from the burner during a cycle. A down-time timer is provided for controlling the time during which the flame is removed from the test piece during a cycle. A heat shield is provided along with means for moving the heat shield between a position intermediate the test piece and the adjacent bunsen burner and a position removed therefrom. First and second microswitches are positioned to contact the conduit when the burner reaches its first and second positions.