1851 Great Exhibition: Official Catalogue: Class X.: Louis Panormo
525. PANORMO, LOUIS, 31 High Street, Bloomsbury — Manufacturer.
Enharmonic guitar (inventor and proprietor, T. Perronet Thompson, Eliot Vale, Blackheath), capable of being arranged in the perfect ratios for upwards of 20 keys; the strings can be lengthened separately at the bridge, to correct the defects of the depression to the neck, or of false or worn strings.