Abstract: Apparatus for sequentially presenting a series of rolls of cloth or paper, etc. to an unwind device, the rolls being precisely positioned for automatically being grasped by chuck members on the unwinder. Storage and transfer means are provided for assuring a constant supply of rolls being presented.

Abstract: An image motion correction is provided for a pyroelectric vidicon which pides a standard television video output signal.

Abstract: A universal joint is disclosed for rotationally coupling a pair of shafts, comprising identical yoke members having paired diametrically opposed axially extending arms telescoped into overlapped but circumferentially spaced relation, and coupling block means interposed between the arms and providing pivotal driving connection therebetween through stub shafts fixedly carried by the block means, the stub shafts projecting into bearing sleeves removably retained in apertures in the arms of the yoke members to permit articulation of the yoke arms relative to the stub shafts of the coupling block in transmitting rotary motion from one yoke member to the other.