Three tuning forks
1871-1900
Gardiner Brown's tuning fork (C3)
1880-1895
Steel tuning fork
1880-1920
Tuning fork
1901-1930
Tuning forks
1880
Tuning forks
1880
Tuning forks
1880
Gradenigo's tuning fork, with amplitude index
1901-1930
Poliker's tuning fork, with sliding scales
1901-1930
Two tuning forks
A440 tuning fork
1880
Tuning fork C256 on resonance box
1900-1943
Tuning fork 'C'
Insulated pickoff fork for oscillogyro
1964-1969
Four tuning forks on resonators
Tuning forks
1880
Tuning forks
1880
Tuning forks
1880
Tuning forks
1880
Electrically maintained tuning fork type D-603-B 800 cps
1968
Tuning fork
1820-1890
Steel tuning fork
1851-1900
Tuning fork for physiological time signalling
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
Twelve tuning forks with ivory hammer
1885
Insulated pickoff fork for oscillogyro
1964-1969
Symn tuning fork
1975-1981
Tuning forks
1880
Tuning fork
1850-1900
Tuning fork
1801-1900
Steel tuning fork
1851-1950
Tuning fork
1850-1950
Tuning Forks and Stands for showing Lissajou's Figures
1870
Steel tuning fork owned by Sir Thomas Lauder Brunton, 1869-1874
1869-1874
Electrically maintained tuning fork
1926-1954
Four tuning forks invented by Gardiner Brown, c 1841-1930.
1901-1930
Gardiner Brown's tuning fork (C) made by Down Bros.
1874-1900
Tuning fork
1939
Tuning fork, Hartmann's C5
1939
Electrically maintained tuning fork by Philip Harris Ltd.
1960-1969
Three tuning forks giving calibrated standards of pitch
1880
Set of thirteen blued steel tuning forks
1900-1980
Drysdale stroboscopic tuning fork
1918
Tuning fork, c 1800-1850.
1801-1850
Dr. C.V. Drysdale's stroboscopic tuning fork
1920
2 tuning forks
1801-1900