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A440 tuning fork

1880

Tuning fork 'C'

Poliker's tuning fork, with sliding scales

1901-1930

Two tuning forks

Tuning fork C256 on resonance box

1900-1943

Gradenigo's tuning fork, with amplitude index

1901-1930

Three tuning forks

1871-1900

Gardiner Brown's tuning fork (C3)

1880-1895

Twelve tuning forks with ivory hammer

1885

Tuning fork for physiological time signalling

Steel tuning fork

1851-1900

Electrically maintained tuning fork type D-603-B 800 cps

1968

Standard 'A' tuning fork and hammer

A435 tuning fork

1880

Tuning fork for operating a time-marker

Original valve maintained tuning fork

A432 tuning fork

1880

Symn tuning fork

1975-1981

Tuning fork

1850-1950

Tuning fork

1801-1900

Steel tuning fork

1851-1950

Steel tuning fork

1880-1920

Tuning fork

1850-1900

Tuning fork

1820-1890

Tuning fork

1901-1930

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

Three tuning forks giving calibrated standards of pitch (A432, A435, A440) tuned by Ellis; on resonance boxes

Three tuning forks giving calibrated standards of pitch

1880

Drysdale stroboscopic tuning fork, by H. Tinsley & Co., No. 6941, c. 1918.

Drysdale stroboscopic tuning fork

1918

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

Four tuning forks on resonators

Four tuning forks on resonators

Tuning forks and stands for showing Lissajous’ figures, wood and brass, London, 1870.

Tuning Forks and Stands for showing Lissajou's Figures

1870

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

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 (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

Steel tuning fork with oval grip and circular stand, owned by British physician Sir Thomas Lauder Brunton (1844-1916) and made by Mayer and Meltzer, London, England, 1869-1874.

Steel tuning fork owned by Sir Thomas Lauder Brunton, 1869-1874

1869-1874

Tuning fork (G), marked Philharmonic, probably made in England, 1801-1950.

Tuning fork, c 1800-1850.

1801-1850

Three mounted tuning forks, in sound boxes.

Three mounted tuning forks

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

One tuning fork HZ, serial no. 491813, type K94E with driving coil amplifier and sensor coil

One tuning fork HZ

Electrically driven tuning fork

Electrically driven tuning fork

Tuning fork and electromagnet to show vibrations microscopically, possibly English, 1850-1900

Tuning fork and electromagnet to show vibrations microscopically

1851-1900

Electrically maintained tuning fork byGriffin & Tatlock Limited.

Electrically maintained tuning fork

1926-1954

Tuning fork (C'), to a design by Alfred Gardiner Brown, 1880-1930.

Tuning fork invented by Alfred Gardiner Brown, c 1880-1930

1880-1930

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