A440 tuning fork
1880
Three tuning forks giving calibrated standards of pitch
- Made:
- 1880
- maker:
- Alexander John Ellis
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 (A432, A435, A440) tuned by Ellis; on resonance boxes
