What other discoveries found their roots in the head of Samuel Pierpont Langley?

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He continued his study of the solar spectrum and made new determinations of the solar constant of radiation and, in 1904, announced his conclusion that this solar constant was a variable. He constructed power-driven model aircraft with specially designed light engines, which, in 1896, performed successfully in the air, thus proving to Langley's satisfaction and to the satisfaction of a few of his followers that mechanical flight was possible.