Arithmetic of pharmacy / by A.B. Stevens.

  • Stevens, A. B. (Alviso Burdett), 1853-1940.
Date:
1920
Catalogue details

Licence: In copyright

Credit: Arithmetic of pharmacy / by A.B. Stevens. Source: Wellcome Collection.

    25/120 (page 11)
    F R Three kinds of thermometers are used for measuring heat: Fahrenheit, Centigrade, and Reaumur. The first is the domestic thermometer of the United States and Great Britain. The second is used for scientific purposes; the third is rarely used in this country. The boiling point of water is 212° F., 100° C., 80° R. The freezing point of water is 32° F., 0° C., 0° R. The difference between the freez- ing- and the boiling-points of water is 180° F., 100° C., and 80° R. Since 180° F. are equal to 100° C., each degree F. is equal to ^®%8o — % of a. de- gree Centigrade, or 8%^^ = % of a degree Reaumur. In a similar manner we find that one degree Centigrade is equal to % of a degree Fahren- heit, or % of a degree Reau- mur. One degree Reaumur is equal to % of a degree Fahr- enheit, or % of a degree Cen- tigrade. A good idea of the construction of the scales of different thermometers may be obtained by studying the illustra- tion. The zero of the Fahrenheit thermometer is 32 de- ll