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Elements of somatology


Elements of somatology

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    Available in PDF Format | Elements of somatology.pdf | Unknown
    George Macintosh Maclean
Excerpt from book: higher temperatures they boil. The barometer standing at 30 inches, hydrochloric ether boils at 52, sulphuric ether at 90, alcohol of s. g. 0.798 at 173, water at 212% oil of turpentine at 314", whale oil at 630, and mercury at 662. Two opinions have been entertained relative to the nature of heat, viz. 1. that it is an imponderable fluid entering into bodies becoming warm, and leaving cooling bodies: 2. that there is diffused through all space an ethereal fluid undulations of which cause the phenomena of heat, as undulations in the air cause those of sound. This dilatation of bodies by heat has been applied to the measuring of its quantity: thermometers and pyrometers are instruments used for that purpose. The great dilatability of air fits it for detecting slight changes of temperature, but renders it inconvenient for general use. Alcohol having never been solidified, anwers well for measuring low temperatures: but being progressively more expansible at high temperatures, and boiling at a low temperature, its use is limited. Mercury expanding more uniformly than perhaps any other liquid, and retaining the liquid form through a great range of temperature, is better calculated for ordinary use than other liquids. To measure temperatures above that of boiling mercury, recourse is had to the expansion of solids : instruments by which this is measured are called pyrometers. Mobility. 18. Mobility is the capability of being conveyed from one to another part of space. Motion has been defined to be a continued change of space, and rest as the contrary. Universal experience having shown the force necessary to move a body to be proportional to its weight, it has been inferred that by the application of suflieient force all bodies may beput in motion. As, in the sacred record, the...  
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