We should add that the cornet tube is an "open" pipe. So is that of the flute. The clarionet is a "stopped" pipe.
[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.
Chapter XVI.
TALKING-MACHINES.
The phonograph—The recorder—The reproducer—The gramophone—The making of records—Cylinder records—Gramophone records.
In the Patent Office Museum at South Kensington is a curious little piece of machinery—a metal cylinder mounted on a long axle, which has at one end a screw thread chased along it. The screw end rotates in a socket with a thread of equal pitch cut in it. To the other end is attached a handle. On an upright near the cylinder is mounted a sort of drum. The membrane of the drum carries a needle, which, when the membrane is agitated by the air-waves set up by human speech, digs into a sheet of tinfoil wrapped round the cylinder, pressing it into a helical groove turned on the cylinder from end to end. This construction is the first phonograph ever made. Thomas Edison, the "wizard of the West," devised it in 1876; and from this rude parent have descended the beautiful machines which record and reproduce human speech and musical sounds with startling accuracy.