wavelength

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On the measurement of wavelengths by the method of comparison
Wolcott Gibbs

American Journal of Science May 1868, s2-45 (135) 298-301; DOI: https://doi.org/10.2475/ajs.s2-45.135.298
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On the spectra and composition of the elements
Gustavus Hinrichs

American Journal of Science November 1866, s2-42 (126) 350-368; DOI: https://doi.org/10.2475/ajs.s2-42.126.350

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