Abstract
A simple effective collimation and alignment mechanism for Schlieren optics in the Spinco model E ultracentrifuge is described. It consists of a pair of jaws sliding in a dovetailed block, one jaw having the slit and being movable by a micrometer screw. A feeler gage between the jaws sets the desired slit opening. A bull's-eye level is attached. (T.R.H.)
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