Reis obtained brief renown, but rejection soon set in. The Physical Society of Frankfurt turned its back on the apparatus which had given it lustre. Reis resigned in 1867, but the Free German Institute of Frankfurt, which elected him as an honorary member, also slighted the instrument as a mere "philosophical toy".
It appears from the report of Herr von Legat, an inspector with the Royal Prussian Telegraphs, which was published in 1862, Reis was quite aware of this principle, but his instrument was not well adapted to apply it.
In 1860, he constructed the first prototype of a telephone, which could cover a distance of 100 meters.
Reis imagined electricity could be propagated through space, as light can, without the aid of a material conductor, and he performed some experiments on the subject. The results were described in a paper, "On the Radiation of Electricity", which, in 1859, he mailed to Professor Poggendorff for insertion in the then well-known periodical, Annalen der Physik.
On 14 September 1859, Reis married, and shortly after he moved to Friedrichsdorf, to begin his new career as a teacher.
His intention was to finish his training at the University of Heidelberg, but in the spring of 1858 he visited his old friend and master, Hofrath Garnier, who offered him a post in Garnier's Institute.
In 1855, he completed his year of military service at Kassel, then returned to Frankfurt to qualify as a teacher of mathematics and science by means of private study and public lectures.
His uncle wished him to become a merchant, and on March 1, 1850, Reis was apprenticed as a paints dealer in the establishment of J. F. Beyerbach, of Frankfurt, against his will.
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