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Nothing is easier now than to calculate, even to a few grains almost, the force of the pressure of air. One can get at the weight of water, thank goodness! and it has been ascertained that our water-column will weigh fifteen pounds if the tube is a square inch in size.
The spring spouted again at seven o'clock in the evening, ascended higher than at noon, and brought up some stones, which looked like black spots and points in the white frothy water-column.
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