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Exposed tuning fork sustained magnetically with driving coil

Tuning fork 'A'

Mounted tuning fork

Mounted tuning fork

Mounted tuning fork

Mounted tuning fork

Mounted tuning fork

60 Cycle Tuning Fork

Tuning fork

Set of eight tuning forks, Unknown maker, 1935-1950

1935-1950

Tuning fork

1701-1900

Tuning fork with chamois case

Set of eight tuning forks

1860-1900

Mounted tuning fork

Tuning fork

Tinsley & Co electrically main

Pair of tuning forks marked W.E.C. London, used as frequency standards for setting up electronic circuits pre-1924. Frequencies 900 and 1000 hertz

Pair of tuning forks marked W.E.C. London