London, England
John Matthias Augustus Stroh (George Evans & Company, 1904-1942)

Mahogany, black stained rosewood fingerboard, mother of pearl, aluminum, metal
ca. 1904 – 1942
Total length:  34.75 in; Neck length: 21.5 in; Metal horn length: 14.3 in; Bell Diameter: 7.25 in
Strings – Lutes – Violin Family

Inscriptions: Metal label (on the right-hand side to the player, below the bridge) reads “CONCERT MODEL / BRITISH MANUFACTURE” around a metal label which reads “STROVIOLS / TRADE MARK / BRITISH MANUFACTURE”.

This Stroh one-string fiddle was patented by John M. A. Stroh, British Patent #9418, 1899 and manufactured by George Evans & Co. in London, England 1904-1942.  John Mathias Augustus Stroh (1828-1914) and an associate, Charles Wheatstone (1802-1875) produced numerous innovations in the study of acoustics.  Stroh then collaborated with his son, Charles Stroh and George Evans, both violin makers, in the development of “Stroh” instruments.  The patent application refers to the attachment of an aluminum diaphram and horn to amplify the sound of a vibrating string. According to the Smithsonian – National Museum of American History, “This concept was adapted for use on modified violins, violas, cellos, mandolins, and guitars.”

The Smithsonian – National Museum of American History further states:  “This instrument is often known as the Japanese fiddle or One-String Jap fiddle. The name likely originated from the Japanese exhibition held in London at the end of the 19th century.  It was produced in three models: “Home,” “Concert,” and “Professional,” priced at 35s, £3 and £12 respectively.”  Seen here is the “Concert” model. 

Reference: Smithsonian – National Museum of American History – https://americanhistory.si.edu/collections/search/object/nmah_6063