Abstract
Minimum Pressures to Excite the Fundamental Note and Octave of a Pipe with Lip at Various Distances from the Edge.---It is well known that as the blowing pressure is increased first the fundamental is excited, then the octave appears, then after an interval of beating the octave alone is heard. With the pipe tested (fundamental pitch 490), as the lip distance was increased from 8 to 12 mm., the minimum pressures for the fundamental and octave, respectively, increased from 0.4 to 0.9 cm. and from 2 to 25 cm. of Hg.Change of Pitch of a Pipe with Blowing Pressure.---This phenomenon is well known. For a particular pipe, studied with the help of phonodeik records, the fundamental pitch increased from 490 to 505 as the pressure was increased from 6 to 32 cm. of water. For 50 cm. of water the pitch (octave) was 1052.
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