James E. Homans, editor

“ Among his principal inventions are his system of duplex telegraphy, which he subsequently developed into quadruplex and sextuplex transmission; the carbon telephone transmitter, now used by nearly all telephones throughout the world, in which the variation in the current is produced by the variable resistance of a solid conductor subjected to pressure, rendering more faithfully than any other transmitter the inflections and changes in the intensity of the vocal sounds to be transmitted ”

“ They are not needed. The cow and pig have gone, and the horse is still more undesirable A higher public ideal of health and cleanliness is working toward such banishment very swiftly; and then we shall have decent streets, instead of stables made out of strips of cobble-stones bordered by sidewalks.” Mr. Edison has invented a system of train-telegraphy between stations and trains in motion, by which messages can be sent from the moving train to the central office, the precursor of wireless telegraphy. He has also invented a method of separating placer gold by a dry process. ”

“ Having determined to investigate the mountain region of New Jersey, I constructed a very sensitive magnetic needle which would dip toward the earth if brought over any considerable body of magnetic iron ore. . . . I had a number of men survey a strip reaching from Lower Canada to North Carolina. ”