Cheapest form of light, from studies at the Allegheny Observatory

S. P. Langley; F. W. Very

doi:10.2475/ajs.s3-40.236.97

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Langley, S. P., & Very, F. W. (1890). Cheapest form of light, from studies at the Allegheny Observatory. American Journal of Science, s3-40(236), 97–113. https://doi.org/10.2475/ajs.s3-40.236.97

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Cheapest Form of Light, From Studies at the Allegheny Observatory