Thus, to refer again to the acoustical analogue in which plane waves are incident upon a perforated rigid screen, the circumstances of the case are best represented by the first method of resolution, leading to symmetrical secondary waves, in which the normal motion is supposed to be zero over the unperforated parts.
SIREN, a name derived from the Greek Sirens (see below) for an acoustical signalling instrument specially used in lighthouses, &c. (see Lighthouse), and applied by analogy to certain other forms of whistle.
- It is natural to consider the frequencies of vibrations of radiating molecules as analogous to the different notes sent out by an acoustical vibrator.
Such curves are often traced mechanically in acoustical and other experiments.
For the theatrical, pageants exhibited by him he erected a theatre with improved acoustical conditions and seats after the Greek model, thus marking a distinct advance in the construction of places of entertainment.
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