João M. B. Lopes dos Santos coauthored an inexpensive speed of sound experiment using two microphones and a computer's stereo sound input. A pulse reaches microphones at different distances at different times; dividing the path difference by the arrival-time difference estimates the propagation speed. Recording both channels together makes the relative delay directly accessible. The apparatus turns wave propagation into a quantitative measurement using familiar audio equipment.[ref]
Figure 1.
Portrait of João M. B. Lopes dos Santos
. SICC/RS (credit printed beneath the source photograph). External portrait hosted by University of Porto, Faculty of Sciences. Source credit: SICC/RS. Source.

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