"In 1831," says Professor Henry, "I arranged around one of the upper rooms of the Albany Academy a wire of more than a mile in length, through which I was enabled to make signals by sounding a bell. The mechanical arrangement for effecting this object was simply a steel bar, permanently magnetized, of about ten inches in length, supported on a pivot, and placed with its north end between the two arms of a horse-shoe magnet. When the latter was excited by the current, the end of the bar thus placed was attracted by one arm of the horse-shoe and repelled by the other, and was thus caused to move in a horizontal plane and its further end to strike a bell suitably adjusted." This was the first "sounding" electro-magnetic telegraph. With this growing fame he was not disposed to think too highly of himself. A friend, noticing a look of sadness in the face of the young professor, said to him,--"Albany will one day be proud of her son;" and so it proved. A year before this, in May, 1830, Professor Henry had married, at thirty-one, Harriet L. Alexander of Schenectady, N. Y., a cultivated and helpful woman. In 1832, Princeton College needed a professor of natural philosophy. Henry's friends heartily commended him for the position. Silliman said,--"Henry has no superior among the scientific men of the country," and Professor Renwick of Columbia College, New York, said, "He has no equal." After six years at the Albany Academy, Henry removed to Princeton, where for fourteen years he added constantly to his fame and usefulness by original work. Of his discoveries in these fruitful years he gives the following summary, at the request of a friend:-- "I arrived in Princeton in November, 1832, and, as soon as I became fully settled in the chair which I occupied, I recommenced my investigations, constructed a still more powerful electro-magnet than I had made before,--one which would sustain over three thousand pounds,--and with it illustrated to my class the manner in which a large amount of power might, by means of a relay magnet, be called into operation at the distance of many miles.... The electro-magnetic telegraph was first invented by me, in Albany, in 1830.... At the time of making my original experiments on electro-magnetism in Albany, I was urged by a friend to take out a patent, both for its application to machinery and to the telegraph; but this I declined, on the ground that I did not then consider it compatible with the dignity of science to confine the benefits which might be derived from it to the exclusive use of any individual. In this perhaps I was too fastidious."