Three tuning forks
1871-1900
Twelve tuning forks with ivory hammer
1885
Tuning fork
1850-1900
Gardiner Brown's tuning fork (C3)
1880-1895
Tuning fork
1850-1950
Gradenigo's tuning fork, with amplitude index
1901-1930
A435 tuning fork
1880
Electrically maintained tuning fork type D-603-B 800 cps
1968
Steel tuning fork
1880-1920
Steel tuning fork
1851-1900
Tuning fork
1901-1930
A440 tuning fork
1880
Two tuning forks
Tuning fork 'C'
Poliker's tuning fork, with sliding scales
1901-1930
Steel tuning fork
1851-1950
Tuning fork
1801-1900
Tuning fork C256 on resonance box
1900-1943
Four tuning forks on resonators
Tuning fork for physiological time signalling
Standard 'A' tuning fork and hammer
Original valve maintained tuning fork
Tuning forks
1880
Tuning forks
1880
Tuning forks
1880
Insulated pickoff fork for oscillogyro
1964-1969
Tuning forks
1880
Tuning forks
1880
Tuning forks
1880
Tuning forks
1880
Tuning forks
1880
Insulated pickoff fork for oscillogyro
1964-1969
Symn tuning fork
1975-1981
A432 tuning fork
1880
Tuning fork
1820-1890
Tuning Forks and Stands for showing Lissajou's Figures
1870
Tuning fork invented by Alfred Gardiner Brown, c 1880-1930
1880-1930
Steel tuning fork owned by Sir Thomas Lauder Brunton, 1869-1874
1869-1874
Set of thirteen blued steel tuning forks
1900-1980
Electrically maintained tuning fork by Philip Harris Ltd.
1960-1969
Four tuning forks invented by Gardiner Brown, c 1841-1930.
1901-1930
Electrically maintained tuning fork
1926-1954
Gardiner Brown's tuning fork (C) made by Down Bros.
1874-1900
Tuning fork and electromagnet to show vibrations microscopically
1851-1900
Tuning fork
1939
Tuning fork, Hartmann's C5
1939
Dr. C.V. Drysdale's stroboscopic tuning fork
1920
Tuning fork, c 1800-1850.
1801-1850
Three tuning forks giving calibrated standards of pitch
1880