Abstract
Stereoscopic presentation of electron micrographs by means of a polarized light projector and polarizing glasses requires carefully aligned slides. Each stereo pair should be aligned so that little if any projector adjustment is required when going from slide to slide. Proper and consistent alignment allows the audience to grasp the stereoscopic information more readily.Figure one shows a photograph of an alignment device for stereos. The two pictures can be moved in four ways: each film can be rotated, and one film translated both horizontally and vertically. The films are held in place by means of a vacuum. This leaves the front open so that the films can be easily transferred to a stereo mask by means of double-sided sticky tape once they are aligned. In practice, a blank slide is first projected and the projector aligned so that the two images of the mask superimpose. The projector controls for horizontal and vertical movement remain fixed and the two films are then projected and moved until they are aligned.
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