Dr. C.V. Drysdale's stroboscopic tuning fork, 50 d.v. per sec., by H. Tinsley and Co., London, SE, no.6944, in wooden case with glazed door Dr. C.V. Drysdale's stroboscopic tuning fork 1920
Set of thirteen blued steel tuning forks, C' to C" scientific pitch (256 to 512Hz) by Ragg, Sheffield, England, in wooden case marked RTF Set of thirteen blued steel tuning forks 1900-1980
Electrically maintained tuning fork by Philip Harris Ltd., Catalogue No. P9962, 1960 to 1970, nominal frequency 256Hz. Electrically maintained tuning fork by Philip Harris Ltd. 1960-1969
Steel tuning fork with oval grip and circular stand, owned by Sir Thomas Lauder Brunton, made by Mayer and Meltzer, London, England, 1869-1874. Steel tuning fork owned by Sir Thomas Lauder Brunton, 1869-1874 1869-1874
Tuning fork (C), to a design by Alfred Gardiner Brown, made by Down Bros., English, 1874-1900. Gardiner Brown's tuning fork (C) made by Down Bros. 1874-1900
Tuning fork (C°), to a design by Alfred Gardiner Brown, made by Arnold and Sons, English, 1880-1895 Tuning fork invented by Alfred Gardiner Brown, c 1880-1895 1880-1895
Tuning fork (G), marked Philharmonic, probably made in England, 1801-1950. Tuning fork, c 1800-1850. 1801-1850
Tuning forks and stands for showing Lissajous’ figures, wood and brass, London, 1870. Tuning Forks and Stands for showing Lissajou's Figures 1870
Drysdale stroboscopic tuning fork, by H. Tinsley & Co., No. 6941, c. 1918. Drysdale stroboscopic tuning fork 1918
Electrically maintained tuning fork byGriffin & Tatlock Limited. Electrically maintained tuning fork 1926-1954
Metal tuning fork, possibly Gardiner Brown's type, personal relic of F.T. Burkitt, made by Lewis, London, English, 1901-1930 Four tuning forks invented by Gardiner Brown, c 1841-1930. 1901-1930
Tuning fork (C'), to a design by Alfred Gardiner Brown, 1880-1930. Tuning fork invented by Alfred Gardiner Brown, c 1880-1930 1880-1930
Five tuning forks used as test forks, in cases marked Marloye, Tuileries, Conservatoire, Chapelle Versailles, Theatre Feydeau. Tuned by Ellis. Five tuning forks used as test forks 1880