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AYLWARD SELF-CENTERING SLIDE-RINGING TURNTABLE
c. 1881
Author: Barry Sobel
Editor: Joseph Zeligs
SLIDE CENTERING MECHANISM:
CLICK ON THE IMAGE REPEATEDLY TO SEE HOW THE MECHANISM CENTERS THE SLIDE. Note that the slide is perfectly centered, but distortion of the image by the glass may make it appear to be slightly off-center