Abstract: In a LED display, photosensors (14) are added to the (periphery of the) display (1) to detect ambient light, and means (20) are provided to compensate for this by adjusting drive signals.

Abstract: An X-ray apparatus with an X-ray source for producing a beam of X-rays, an X-ray detector for detecting the beam, and an X-ray filter with filter elements which is arranged between the X-ray source and the X-ray detector so as to attenuate the X-ray beam in each independent filter element individually. Each filter element (13) can receive a liquid (22) which is electrically conductive and X-ray absorbing, and is supplied via a transport channel (20), the X-ray absorptivity of each filter element being discretely adjustable by step-wise adjustment of the level of the liquid (22) in each filter element. Each filter element includes a first electrode (23) which is located in the wall of the filter element, on top of a substrate layer (38), in order to apply an electric potential to the wall of the filter element. A second electric potential is applied to the liquid (22) via a second electrode (29).

Abstract: A hard wear-resistant and corrosion- and oxidation-resistant stainless steel article is made by precision machining a work piece of approximately the size and shape of the desired article, then subjecting the resulting cold worked article to ion bombardment until the article is nitrided to a depth of about 0.002 inch, and finally subjecting the nitrided article to an atmosphere of argon and nitrogen and oxygen until the resulting ion bombardment has penetrated to a depth in the article surface of about 0.0001 inch.

Abstract: A bale stacking implement comprising mechanism for guiding bales into groups and for angularly displacing alternate groups relative to the length of the implement, and comprising mechanism for stacking said groups in their alternate angularly displaced and angularly undisplaced dispositions, the construction and arrangement of the implement being such that, during the operation thereof, at least some of the bales are in contact with the ground during at least part of the formation thereof into said stacks.