Such curves are often traced mechanically in acoustical and other experiments.
A grain of anger or a grain of suspicion produces strange acoustical effects, and makes the ear greedy to remark offense.
Some examples of different types of guitars are the electric guitar, the base guitar, the 12-string guitars and the non-electric acoustical guitar.
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.
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.