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7If the addition or removal of the wedges should not be attended by a correspondent increase or decrease in the days, for the wedges are frequently imperfect, it is to be thus remedied. Let the hours from the analemma be placed on the column transversely, and let the lines of the months be also marked thereon. The column is to turn round, so that, in its continual revolution, the wand of the figure, as it rises, points to the hours, and, according to the respective months, makes the hours long or short.
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