Abstract
An earlier study [R. E. Ross and T. D. Rossing, J. Acoust. Soc. Am. Suppl. 1 65, S72 (1979)] indicates that the bracing pattern of the top plate, through its influence on the modes of vibration of the top plate, has a substantial influence on the acoustical properties of a guitar. We therefore tested six guitar top plates of identical shape (but varying in thickness and type of wood) in the raw state and again after various patterns of bracing had been applied and a sound hole cut. The modes of vibration were observed with both free and clamped edges. The vibrational modes of the unbraced plates resemble those of a rectangular plate, but the modes of the braced plates are considerably less predictable. Special thanks are due to luthiers Jim Williams, Gerard Gilet, and Robin Moyes, who supplied the plates used in these studies. [Work supported in part by the U.S.‐Australia Cooperative Science Program while the author was at the University of New England.]
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