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11. The three specific elements which must be observed, are the capacity, the
conducibility proper or permeability, and the external conducibility or
first as constant numbers, independent of the temperatures
have not the same intensity. The intensity of each ray is proportional
1 Each paragraph of the Table indicates the matter treated of in the articles
to the cosine of the angle which its direction makes with the normal to
GENERAL NOTIONS AND PRELIMINARY DEFINITIONS.
by O is that of melting ice. The temperature of water boiling in a
in liquids . . .
38, 39. Equilibrium of temperatures. The effect is independent of contact. 32
40—49. First notions of radiant heat, and of the equilibrium which is
established in spaces void of air ; of the cause of the reflection of rays
50, 51. First notion of the effects of reflected heat
52–56. Remarks on the statical or dynamical properties of heat. It is the
principle of elasticity. The elastic force of aeriform fluids exactly indi-
cates their temperatures.
PRINCIPLE OF THE COMMUNICATION OF HEAT.
57—59. When two molecules of the same solid are extremely near and at
unequal temperatures, the most heated molecule communicates to that
THE HEATING OF CLOSED SPACES.
air, n the temperature of the external air, g, h, H measure respectively
boundary, and K its conducibility proper .
85, 86. Remarkable consequences of the preceding equation .
87–91. Measure of the quantity of heat requisite to retain at a constant
temperature a body whose surface is protected from the external air by
EQUATION OF THE VARIED MOVEMENT OF HEAT IN A Ring.