Wells's principles and applications of chemistry; . n England, Holland, and the United States, the thermometer most gener-ally used is Fahrenheits. Eeaumurs scale is used in Germany, and the Cen-tigrade in France, Sweden, and some other parts of Europe. The scale ofthe Centigrade is by far the simplest and most rational method of graduation,and at present it is almost universally adopted for scientific purposes. The scale employed in the present work is that of Fahrenheits. The thermometer was invented about the year IGOO; but, like many otherinventions, the merit of its discovery is not to be
Wells's principles and applications of chemistry; . n England, Holland, and the United States, the thermometer most gener-ally used is Fahrenheits. Eeaumurs scale is used in Germany, and the Cen-tigrade in France, Sweden, and some other parts of Europe. The scale ofthe Centigrade is by far the simplest and most rational method of graduation,and at present it is almost universally adopted for scientific purposes. The scale employed in the present work is that of Fahrenheits. The thermometer was invented about the year IGOO; but, like many otherinventions, the merit of its discovery is not to be ascribed to one person, butto be distributed among many. The variety of circumstances under which thermometers are used, haveoccasioned a considerable variety in their form. The following are some ofthe most important of th^se modifications. 128. Tlie Self-Registering Thermometer is a form ofthermometer contrived for the purpose of ascertaining theextremes of variation which may occur during a particularinterval of time, as in the night. Fig. It consists of two horizontal thermometers attached to one frame, as is rep-resented in Fig. 32, the one, A, containing mercury, and the other, B, spiritsof wine. On the surface of the mercurial column in the tubo is placed a * The temperatures expressed by one thermometer scale may be easily reduced to thatof another, by remembering that 9° of Fahrenheit are equivalent to 5 of Centigrade, or4-^ of lleaumur. In converting Fahrenheit to Reaumur, or-Centigrade, if the degree boabove the freezing point, 32^ must be first subtracted, i;i order ta reduce the degrees ofthe other scales to those of Falirenheit; but in the conversion of Reaumur or Centigradeto Fahrenheit, 32= must be added. Questions.—When -was the thermometer invented ? ^Vllat ij a solf-rcgistoiing ther-mometer ? Describe its construction ? 86 PRINCIPLES OF CHEMISTRY. piece of steel-wire, and on the surface of the spirits of wine, a piece of blackenamel, or ivory. As the
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectchemistry, bookyear18
