Another difficulty is the fact that all bodies tend to radiate their
heat to each other, till an equal temperature exists. Thus, the human
body is constantly radiating its heat to the walls, floors, and cooler
bodies around. At the same time, a thermometer is affected in the same
way, radiating its heat to cooler bodies around, so that it always
marks a lower degree of heat than actually exists in the warm air
around it. Owing to these facts, the injected air of a furnace is
always warmer than is good for the lungs, and much warmer than is ever
needed in rooms warmed by radiation from fires or heated surfaces. The
cooler the air we inspire, the more oxygen is received, the faster the
blood circulates, and the greater is the vigor imparted to brain,
nerves, and muscles.
Scientific men have been contriving various modes of meeting these
difficulties, and at the close of this volume some results will be
given to aid a woman in selecting and managing the most healthful and
economical furnace, or in providing some better method of warming a
house. Some account will also be given of the danger involved in
gas-stoves, and some other recent inventions for cooking and heating.
Pages:
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118