. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. 18 THREE CRUISES OF THE " BLAKE. each arm of the bridge, and the steel-wire serves as the return earth connection for both. Sir WilHam Thomson's marine gal- vanometer, with a mirror and scale, is employed to determine the balance of the bridge. (Fig. 14.) The apparatus was set up on board the " Blake" in April, 1881, and experiments were made off the east coast during. Fig-. 14. —Wheatstone's Bridge. (Bartlett, U. S. Coast Survey.) August. In each series of experiments the temperatures at dif-
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. 18 THREE CRUISES OF THE " BLAKE. each arm of the bridge, and the steel-wire serves as the return earth connection for both. Sir WilHam Thomson's marine gal- vanometer, with a mirror and scale, is employed to determine the balance of the bridge. (Fig. 14.) The apparatus was set up on board the " Blake" in April, 1881, and experiments were made off the east coast during. Fig-. 14. —Wheatstone's Bridge. (Bartlett, U. S. Coast Survey.) August. In each series of experiments the temperatures at dif- ferent depths were first taken by Miller-Casella thermometers attached to a soundino^-wire. A sinker was then fastened to the resistance-coil, and it was lowered by the cable to the same depths, when the temperature was read by means of the mer- curial thermometer attached to the comparison-coil. The depths at which reading's were taken rangfed from the surface down to eight hundred fathoms, and experiments were made in both rough and still water. The temperatures recorded varied from ° to ° F. In every case the readings of the electrical. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum
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Keywords: ., bookauthorha, bookcentury1800, bookdecade1860, booksubjectzoology
