29
It is obvious that in Fig. 136, 2, a pulse will pass from A to B and back in one-third the time required for it to pass from A to B and back in Fig. 136, 1.
30
The science of hearing; from the Greek verb, ἀκούειν, "to hear."
31
"Organs and Tuning," p. 245.
32
The Edison Bell phonograph is here referred to.
33
Some of the sibilant or hissing sounds of the voice are computed to be represented by depressions less than a millionth of an inch in depth. Yet these are reproduced very clearly!
34
The "Romance of Modern Mechanism," p. 243
35
Inventor of the lathe slide-rest.
36
Living germs; some varieties the cause of disease.