Inclined Plane, Wedge, and Screw; mechanical advantage and efficiency.
Friction; uses, how reduced, coefficient of, laws (3).
Water Wheels; types, efficiency, uses.
[CHAPTER VII]
HEAT, ITS PRODUCTION AND TRANSMISSION
(1) Sources and Effects of Heat
138. Importance of the Study of Heat.—Heat is brought to our attention through the sensations of heat and cold. In winter, we warm our houses and prevent the escape of heat from them as much as possible. In summer we endeavor to keep our living rooms cool and our bodies from being overheated.
A clear understanding of the several sources, effects, and modes of transferring heat is of importance to everyone living in our complex civilization, especially when we consider the multitudes of objects that have as their principal use the production, transfer or utilization of heat.