Jean Gallon Jean Gallon Jean Gallon (25 June 1878 - 23 June 1959) was a French composer, choir conductor, and music educator. His compositional output consists of six antiphons for strings and organ, one mass, one ballet, and several art songs. Born in Paris, Gallon was the elder brother of composer Noël Gallon. He had a long association with the Paris Conservatoire, first as a student, then as the director of concerts (1906-1914), and then as a faculty member from 1919 to 1949. A professor of harmony, he taught such notable musicians as Elsa Barraine, Paul Bonneau, Henri Challan, Georges Dandelot, Jean-Yves
Gallon "ale gallon" known as the "imperial gallon" and abolished all other gallons in favour of it. Inspired by the kilogram-litre relationship, the imperial gallon was based on the volume of 10 pounds of distilled water weighed in air with brass weights with the barometer standing at 30 inches of mercury and at a temperature of . In 1963, this definition was refined as the space occupied by 10 pounds of distilled water of density weighed in air of density against weights of density (the original "brass" was refined as the density of brass alloys vary depending on metallurgical composition). This