intensity

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Studies of the phenomena of simultaneous contrast-color; and on a photometer for measuring the intensities of lights of different colors
A. M. Mayer

American Journal of Science July 1893, s3-46 (271) 1-22; DOI: https://doi.org/10.2475/ajs.s3-46.271.1
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On the intensity of sound; II, The energy used by organ pipes
Charles K. Wead

American Journal of Science July 1891, s3-42 (247) 21-34; DOI: https://doi.org/10.2475/ajs.s3-42.247.21
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Measures of the intensity of solar radiation
William Ferrel

American Journal of Science May 1891, s3-41 (245) 378-386; DOI: https://doi.org/10.2475/ajs.s3-41.245.378

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