The trials were made with a Gagneau lamp provided with a chimney of the
ordinary shape, and then with one of Mr. Bayle's. The measurements were
made after each had been burned half an hour. The light of the standard
Carcel lamp being 1, there was obtained with the Gagneau lamp with the
ordinary chimney 1.113 carcels, and with the Bayle chimney 1.404 carcels.
Thus 1.113:1.404 represents the ratio of the same lamp with the ordinary
chimney and with that of Bayle. Whence it follows that the light of the
lamp with the old chimney being 1, that with the new one is 1.26, say an
increase of about 25 per cent. There is nothing absolute about this
figure, however. On kerosene lamps the new chimney, compared with the
contracted Prussian one, gives an increase of 40 per cent. in illuminating
power, and the oil is burned without odor or smoke.
As it was of interest to see whether this increase in intensity was not
due to a greater consumption of oil, a determination was made of the
quantity of the latter consumed per hour. The Gagneau lamp, with the old
chimney, burned 62.25 grammes per hour, and with the Bayle 63 grammes in
the same length of time.
It may be concluded, then, that the increase in light is due to the
special form given the chimney.
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