The American journal of the medical sciences (1827)
[Thorofare, N.J., etc.] Charles B. Slack [etc.] · leaf 448
R is ley, A New Optometer. 450 [Oct. screw firmly to the table.1 To this is attached a movable chin rest b, a pair of graduated semicircles c, with their concavity upward for the recep- tion of trial glasses, stenopaic slit, etc., a graduated triangular bar m, 20/r long, supporting a carrier L,… … A. Stand. B. Chin rest. C. Holders for test glasses, etc. M. Carrier bar. L. Carrier. H. Perimeter. I. Fixation point. D. Slide. K. Perimeter head and graduated scale. G G. Semi- circles showing three grooves for glasses, etc. 1 and 2. Milled head screws. The stand is a hollow cylinder admitting a…
Medicine
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