Table 3 Pitch test reports of the 16 brass bells.

Conducted on April 18, 2023, from 10:00 to 13:00. Temperature: 25 °C; humidity: 70–80%. Assistants: Yating Liao, Xiaobang Ling, Rongzhen Fu. Procedure: one individual grasped a bell in their hands, and another individual struck the designated positions with a wooden mallet. The process involved striking one A-tone position 3 times, then 3 times on the other A-tone position. As a B-tone was harder to generate, each of the four B-tone positions was then struck 3 or more times. If there is only one figure in a grid, this indicates that only one frequency was consistently recorded from all relevant positions. If there is more than one frequency recorded, the first frequency in that grid, before the semicolon, represents the clearest pitch that most frequently occurred. Only frequencies that differ by 3 Hz or more from the clearest pitch will be recorded. For example, a frequency of 369 Hz for the A-tone of brass bell B4 would not be recorded.

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