Rudolf Koenig (1832-1901) was one of the more colourful figures of nineteenth-century physics. Master violinmaker, innovative scientific instrument maker, prolific researcher and moderately successful businessman, Koenig made it possible, through his acoustical apparatus, for people around the world to study the science of music. When in Paris, scientists visited Koenig’s studio for his famous "musical séances." One of his best customers was James Loudon of Toronto, founder of the first physics laboratory in Canada (1878).

A few of his more popular instruments included his resonators for selecting specific frequencies from surrounding sounds, reed and organ pipes for sound production, manometric flame capsules for visualizing sound, tuning forks for precision tuning, and sound interference apparatus for comparing the properties of two sound waves.

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