A laboratory course in experimental physics (1896)
Loudon, W. J. (William James), McLennan, John Cunningham, joint author · New York and London, Macmillan and Co. · leaf 241
screen there is a small openingimmediately below the scale, with a dark thread stretched verti-cally across it. When this opening is illuminated with parallelrays of light from some source an image is formed by themirror on the scale, and any displacement of this image will atonce indicate the…
Physics
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