Abstract
In May 1975, Hellier et al. (see ibid., vol.8, p.352) reported on their integrated circuit pulse echo overlap (PEO) facility for measurement of sound velocity. They proposed their integrated circuit as part of a do-it-yourself alternative to purchasing a commercial PEO instrument, mentioning, as a footnote, only one of the manufacturers from whom such PEO equipment is available. To maintain correct historical perspective, it is pointed out that PEO equipment employing similar integrated circuitry, has been available from another manufacturer in standard commercial PEO instruments since 1972.
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