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HARTLE'S OPTICAL DISC
Circular metal disc graduated in degrees with alternate 10° sections painted black, and with cross lines at 90° intervals to mark the center. Mounted on a wooden base and rotatable about a vertical axis. The lamp house arrangement is also mounted on the same base, providing a parallel beam of light. Outline of accessories drawn on disc surface, showing where they may be placed and held down by screws with collars. A comprehensive range of experiments related to various optical principles can be performed using accessories.