Abstract: A method and apparatus for statically aligning, checking or monitoring the alignment of a first shaft with a second shaft, one shaft being preferably chosen as a reference shaft to which the other shaft is aligned, the apparatus comprising a first mount means mounted on the first shaft and having mounted thereon a first dual-axis radiation sensing means and means for providing a first radiation beam, a second mount means mounted on the second shaft and having mounted thereon a second dual-axis radiation sensing means and means for providing a second radiation beam, the first radiation beam oriented to impinge upon the second dual-axis radiation sensing means to generate a second signal, the second radiation beam oriented to impinge upon the first dual-axis radiation sensing means to generate a first signal, and readout means having defined alignment conditions responsive to the first signal and the second signal for visually displaying shaft alignment, with alignment of the two shafts indicated by the first s

Abstract: A method and apparatus for positioning a shaft aligning sensing structure on a shaft to a calibrated position comprising, a support, first means on the support controlling movement of the shaft aligning sensing structure from a first position to a second position, positioning means mounted on the support acting with the surface of the shaft and cooperating means mounted on the shaft aligning sensing structure responsive to the positioning means, whereby the positioning means reacts to the diameter of the shaft and causes the cooperating means to position the shaft aligning sensing structure at the calibrated position.

Abstract: A collimator for use with a beam of radiation, and in particular, for use in controlling the cross-sectional size and shape of the radiation beam and intercepting undesired off-focus radiation in an x-ray apparatus. The collimator is adapted to be positioned adjacent the source of radiation and embodies a plurality longitudinally extending leaves pivotally mounted on and between two supports, the leaves moveable about their pivots to close overlapping relation to effectively define a hollow cone. The cone defines an aperture at its narrow end which can be adjusted in size and shape by rotation of the two supports which are adaptable to being moved one relative to the other, to thereby cause an expansion or contraction of the hollow cone and correspondingly an increase or decrease of the cross-sectional size and/or shape of the radiation beam passing through the aperture.