PERPETUAL CALENDAR MADE FOR THE COLUMBIAN EXHIBITION, American, 1892, signed “Perpetual Calendar, Patd. 1891 & 1892 by W.W. Kitchen.” Made of aluminum, 1-3/16″ (3 cm) in diameter, the disk bears on one side a raised profile of Christopher Columbus, and on the other a calendar marking every seventh day of each month. At the center is inset a brass volvelle with the days of the week. Setting this volvelle once per year allows direct readout of the day of
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