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But if it be abnormal, as is said, it is remarkable that precisely the same temperature was met with at about the same height on the second ascent. Another object was, to bring down specimens of air from different altitudes, for analysis; to try the effect of the actinometer at great elevations; and to note the hygrometric condition.
Rudge & Co., of Coventry, represented in the cut. Photo. News. A printing frame is placed in the carrier, and exposed to the light of a gas burner kept at a fixed distance, behind which is a spherical reflector. The same frame may be used for other purposes.-Photographic News. A selenium actinometer has been described in the Comptes Rendus in a communication from M. Morize, of Rio de Janeiro.
He then refers to the actinometer and pyroheliometer, instruments for measuring the actual heat derived from the sun, and also to the Bolometer, an instrument invented by Professor Langley for measuring the invisible heat rays, which he has proved to extend to more than three times the length of the whole heat-spectrum as previously known, and has also shown that the invisible rays contribute 68 per cent, of the sun's total energy.
Despite my serious predicament I could not refrain from indulging in an outburst of laughter which only served to annoy them still further. The mystery was not a new type of infernal machine as they imagined but merely a home-made actinometer!
A few days previous to the beginning of that year, Herschel began observing at the Cape of Good Hope with an "actinometer," and obtained results agreeing quite satisfactorily with those derived by Pouillet from experiments made in France some months later with a "pyrheliometer."
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