About 32 years ago the Reverend and Learned Mr. John Caswell, the Professor of Astronomy in Oxford propos'd to me the following hydrostatical Problem. Having two Glass Bubbles, as A and B, in a Jar of Water, one swimming at top of the Water, as from the Vessel I, to make the said Bubbles change Places, so that A shall come up to the Surface at a, and B go down to the Bottom at b. I found it out, and made the Experiment; but I refer the manner of doing it to the Notes; that the Reader may try to find it out before he has it explain'd.
J. T. Desaguliers (1745). A course of experimental philosophy. London. |
