Abstract
THE following is an interesting combination:—When the polariser and analyser are crossed, insert a concave plate of quartz cut parallel to the axis, with its axis inclined at 45° to that of the polariser, add to this a quartz wedge cut also parallel to the axis, having its axis placed perpendicular to that of the concave plate. The coloured circles, shown by the concave plate alone, will be seen to be displaced in the direction of the thicker edge, to a distance dependent upon the angle of the wedge. Also, as the wedge is made to slide in or out, the circles will be seen to expand or contract, according as the thicker or thinner part of it is presented to the field of view.
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SPOTTISWOODE, W. Polariscope Objects . Nature 15, 275–276 (1877). https://doi.org/10.1038/015275f0
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DOI: https://doi.org/10.1038/015275f0