CHAPTER VIII

. RADIATION THERMOMETERS.

82. Solar and Terrestrial Radiation considered.

83. SOLAR RADIATION THERMOMETER.

84. VACUUM SOLAR RADIATION THERMOMETER.

85. TERRESTRIAL RADIATION THERMOMETER.

86. AETHRIOSCOPE.

87. PYRHELIOMETER.

88. ACTINOMETER.

## CHAPTER IX . DEEP-SEA THERMOMETERS.

89. ON SIXE'S PRINCIPLE.

90. JOHNSON'S METALLIC THERMOMETER.

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