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Zentmayer eclipse slide showing partial phase well advanced.
Zentmayer eclipse slide showing total phase. The sliding glass holding the “Moon,” has completely obscured the hole representing the Sun and has released the cover, thus exposing the corona.
Franklin Institute eclipse projector as constructed by the Bausch and Lomb Optical Company. The large glass disc, carrying the smaller Moon discs, rotates in a counter clock-wise direction. The stereopticon on the left projects the Baily’s bead, the one on the right, the corona.
Franklin Institute eclipse projector from the rear, showing the driving motor, gears, cams to operate the mercury switches, and automatic dissolves, and controller.
Franklin Institute eclipse projector in use, showing the corona projected on the screen.