Tunings of historical Korean pyeongyeong and pyeonjong Free

In order to reconstruct the whangjongeum or scale in Korean traditional instruments, we have measured frequencies of historical pyeongyeong stones and pyeonjong bells mainly from the 14th to 19th centuries. Pyeongyeong consists of 16 chime stones tuned to a scale quite similar to the Western scale beginning with C4. Pyeongjong consists of 16 chime bells, tuned approximately an octave lower than pyeongyeong. We present frequency averages and standard deviations for 124 chime stones and 64 chime bells available in the National Center for Korean Traditional Performing Arts. The spread in frequencies appears to be greater in some periods in history than in others, but the average frequency is quite consistent.