. Contributions to the Centennial Exhibition. Vi. Plate 30. See Ciiap. XIX. Rapid-Indkwtiox Actinometer, for ME.vsrRixo THE Intensity of Solar Radiation. Designed by John Ericsson. Manufactured at New York, 18T3.. Plate 31. See Chap. XX. ApPAKATUS IOK ASCKKTAINING TlIK DlATUKlUIANCV OF Fl^JIKS. Designed by Joun Ericsson. Constructed at New York, 1872.
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