Abstract
The tudumi a kind of drum with dumb-bell-shaped body. Present paper contains the results of investigations on the tone-colour of the two kinds of the udumi riz.the kotudumi and okawa.The sounds were recorded. similarly as in the previous works, by means of a condenser microphone and oscillograph. Generally speaking, the sound of the kotudumi contains, besides the fundamental, a partial tone having a frequeucy slightly smaller than thritce that of the fundamental. Among the four kinds of tone--ta, ti, pit and po produced by the kotudumi or shoulder drum, the pitch of the first two is in the neighbourhood of 3oo or d', while the other two are about one full tone lower. The po tone is the most characteristie, the tension of the membrane being removed immediately after a stroke, and it is found that the pitch is lowered about one full tone within 0.15 see. after the stroke. The sound of the okawa or sidedrum is found to be comparatively simple, consisting mainly of a tone having a pitch of about 650; the tone being therefore about one octave higher than the to and ti of the kotudumi. Its duration is very short, the amplitude decreasing to a half value within one fiftieth second
