A system of natural philosophy, designed for the use of schools and academies (1845)
Moffat, J[ohn] M. [from old catalog] · Philadelphia, E. C. Biddle · leaf 332
assing throughglass, from those which are perceived in the passage of solar heat,they may probably depend on the far inferior intensity of the heatarising from combustion compared with that of the sun. Forwhen a very intense artificial heat with light is produced, as thatof charcoal ignited by a… … 152. That heat radiates from bodies in right lines, and that itmay be reflected to a focal point by a mirror, like light, may be de-monstrated by the apparatus represented above. It consists oftwo concave mirrors, A and B, of planished tin or plated copper,about one foot in diameter, and placed…
Physics
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