Patent for "a perpetual calendar embodying such a construction that the movement of a finger device will turn wheels, so as to successively display the names of the days of the week, the numbers of the days of the months, and the names of the months, the mechanism being such that the name of a month will be displayed until the numbers of all its days have been displayed, when the name of the succeeding month will be displayed, and so on." (Lines 13-22) Includes instructions and illustrations.