es similar to those of the disk, so that coin- cidences occur. Air is forced into the cylinder from the bel- the condensed portion of the wave. In Fig. 2 the wave of THE PROCESSES OF SCIENTIFIC THOUGHT. lows. When the apertures in the disk coincide with those condensation has become one of… … conceptions already in his mind to arrive at the emission sion to and fro over the length, X Y, oscillating, in other higher the pitch of the note. By this means any number of theory of light. He supposed light to consist of elastic par- words, throughout this distance. vibrations due to a sound…
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