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Eisco Resonance Tuning Forks with Hammer

Eisco-Resonance-Tuning-Forks-with-Hammer-Eisco-PH0742A-P-This-apparatus-can-be-used-for-demonstrating-the-production-of-beat-frequencies-P-P-It-is-comprised-of-two-nickel-plated-tuning-forks-mounted-on-individual-sound-boxes-The-two-forks-both-produce-an-A-note-440Hz-when-struck-with-the-mallet-P-P-One-fork-is-provided-with-an-adjustable-mass-by-means-of-which-the-frequency-of-that-fork-may-be-shifted-from-the-nominal-440Hz-When-both-forks-are-sounded-at-the-same-time-a-clearly

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