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Mounted tuning fork

Mounted tuning fork

Mounted tuning fork

Mounted tuning fork

Mounted tuning fork

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

1935-1950

Tuning fork

1701-1900

60 Cycle Tuning Fork

Tuning fork with chamois case

Tuning fork

Exposed tuning fork sustained magnetically with driving coil

Tuning fork 'A'

Tinsley & Co electrically main

Set of eight tuning forks

1860-1900

Mounted tuning fork

Tuning fork

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