. Edinburgh New Philosophical Journal. Density of Brine in Boilers of Marine Steani-Engines. 281 cate the density is in the lower stratum, not the upper one, where the usual glass gauge is placed, and irretrievable mis- chief might be done before the indication would shew any change. I have lately employed, in some large ships destined for transatlantic voyages, a species of brine-gauge, or index of saturation, which is found to possess every advantage, and which I therefore desire to communicate to the public through this Society. The drawings sent are such as may enable any engineer to const
. Edinburgh New Philosophical Journal. Density of Brine in Boilers of Marine Steani-Engines. 281 cate the density is in the lower stratum, not the upper one, where the usual glass gauge is placed, and irretrievable mis- chief might be done before the indication would shew any change. I have lately employed, in some large ships destined for transatlantic voyages, a species of brine-gauge, or index of saturation, which is found to possess every advantage, and which I therefore desire to communicate to the public through this Society. The drawings sent are such as may enable any engineer to construct them for himself. The details of the arrangement of the apparatus were made under the direction of Mr James Laurie, formerly one of my assistants ; and he also has obliged me by writing out the annexed description of the operation of using the index. The principle I have used is the well-known law, " that the heights of equiponderant columns of liquids vary inversely as the densities of those ; If I take open glass tubes bent in the form of the letter U. as in the diagram (fig. 1), and pour one fluid into one of the sides, and another fluid into the opposite side (taking care to use the heavier liquid before the other); the one being mer- cury, and the other water, they will stand at the height of 1 inch and 13 inches respectively. If I use alcohol and water (fig. 2), they will stand at the height of 10 inches and 8 inches respectively, the height of the one fluid being always greater than that of the other, in the proportion in which its weight, density, or specific gravity is less. Fig. 1. Fig. 2. Fig. 3. Uatcr. Waltr = Merruiy Alcohc Watf â i- Sail Water. 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
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