[Fig. 112.—The N. Y. Herald station, showing aerial.]

[Fig. 113.—Operator Jack Irwin overhauling the wireless apparatus for the dirigible balloon "America".]

[Fig. 114.—Morse code.]

[Fig. 115.—Continental code.]

[Fig. 116.—Transmitting equipment of the high-power station at Nauen.]

[Fig. 117.—Duplex receiving apparatus.]

[Fig. 118.—Breaking-in system.]

[Fig. 119.—The receiving apparatus of the station at Nauen.]

[Fig. 120.—Diagram of the ear.]

[Fig. 121.—The ossicles.]