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6On these also, either on columns or pillars, the hours are marked, to which a figure, holding a wand and rising from the lower part, points throughout the day, the increase and decrease whereof is daily and monthly adjusted, by adding or taking away certain wedges. To regulate the flow of the water, stoppers are thus formed. Two cones are prepared, one convex, the other concave, and rounded so as to fit exactly into each other. A rod, by elongating these, or bringing them together, increases or diminishes the flow of water into the vessel. In this manner, and according to the principles of this machine, water-dials for winter are constructed.
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