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A physicist whose research joined waves, optics, acoustics and precise measurement. He maintained a laboratory at Terling and served as Cavendish professor of experimental physics from 1879 to 1884. At Cambridge he developed laboratory courses; later he donated his Nobel award proceeds toward a Cavendish laboratory extension.^[ref]

The Rayleigh-Ramsay argon density experiment, pursued with William Ramsay, connects a small discrepancy in gas weighing to chemical separation. Its lesson is practical: agreement within one preparation method does not ensure that a second method produces the same chemical substance. The gas density model explains how composition and filling conditions both affect the readout.

By John William Strutt, 3rd Baron Rayleigh, credited as Lord Rayleigh. Philosophical Magazine, Series 5, 10(60), 73–78 (August 1880). The manuscript ends June 1880; 28 April 2009 is the publisher online date.

DOI: doi.org/10.1080/14786448008626893

Inspected transcription: www.scribd.com/document/472852365/Rayleigh1880

Cited passages: pp. 73–74, expected intensity; pp. 75–77, planar construction and polar integration; pp. 77–78, unequal component amplitudes. The argument concerns large numbers of components.

A chemist who led the chemistry department at University College London from 1887 to 1913. His isolation of argon followed John William Strutt, 3rd Baron Rayleigh's observation that atmospheric nitrogen had greater density than chemically prepared nitrogen.^[ref]