FORESHADOWINGS OF THE MAGNETIC TELEGRAPH.
O utinam hæc ratio scribendi prodeat usu,
Cautior et citior properaret epistola, nullas
Latronum verita insidias fluviosve morantes:
Ipse suis Princeps manibus sibi conficeret rem!
Nos soboles scribarum, emersi ex æquore nigro,
Consecraremus calamum Magnetis ad aras!
The Prolusiones Academicæ of Famianus Strada, first printed in 1617, consist of a series of essays upon Oratory, Philosophy, and Poetry, with some admirable imitations of sundry Roman authors, in the style of Father Prout’s Reliques. In the imitation of Lucretius, ii. 6, is a description of the loadstone and its power of communicating intelligence, remarkable as foreshadowing the modern method of telegraphic communication. The following is a literal translation of the curious passage:—
The Loadstone is a wonderful sort of mineral. Any articles made of iron, like needles, if touched by it, derive by contact not only peculiar power, but a certain property of motion by which they turn ever towards the Constellation of the Bear, near the North Pole. By some peculiar correspondency of impulse, any number of needles, which may have touched the loadstone, preserve at all times a precisely corresponding position and motion. Thus it happens that if one needle be moved at Rome, any other, however far apart, is bound by some secret natural condition to follow the same motion.
If you desire, therefore, to communicate intelligence to a distant friend, who cannot be reached by letter, take a plain, round, flat disc, and upon its outer rim mark down the letters of the alphabet, A, B, C, &c., and, traversing upon the middle of your disc, have a needle (which has touched loadstone) so arranged that it may be made to touch upon any particular letter ad libitum. Make a similar disc, the exact duplicate of this first one, with corresponding letters on its margin, and with a revolving magnetized needle. Let the friend you propose corresponding with take, at his departure, one disc along with him, and let him agree with you beforehand on what particular days and at what particular hours he will take observation of the needle, to see if it be vibrating and to learn what it marks on the index. With this arrangement understood between you both, if you wish to hold a private conversation with this friend, whom the shores of some distant land have separated from you, turn your finger to the disc and touch the easy-moving needle. Before you lie, marked upon the outer edge, all the various letters: direct the needle to such letters as are necessary to form the words you want, touching a little letter here and there with the needle’s point, as it goes traversing round and round the board, until you throw together, one by one, your various ideas. Lo! the wonderful fidelity of correspondence! Your distant friend notes the revolving needle vibrate without apparent impulse and fly hither and thither round the rim. He notes its movements, and reading, as he follows its motion, the various letters which make up the words, he perceives all that is necessary, and learns your meaning from the interpreting needle. When he sees the needle pause, he, in turn, in like manner touches the various letters, and sends back his answer to his friend. Oh that this style of writing were brought into use, that a friendly message might travel quicker and safer, defying snares of robbers or delaying rivers! Would that the prince himself would finish the great work with his own hands! Then we race of scribblers, emerging from our sea of ink, would lay the quill an offering on the altars of the loadstone.
This idea of Strada is based upon the erroneous impression entertained generally at the time when he wrote, that magnetic power, when imparted by the loadstone to metallic articles like needles, communicated to them a kind of homogeneous impulse, which of necessity caused between them a sympathetic correspondence of motion.
The curious reader will be further interested to learn from the following passage, extracted from the “Tour” of Arthur Young, the distinguished agriculturist, who travelled through Ireland in 1775–78, that the theory of electrical correspondence by means of a wire was practically illustrated before Mr. Morse was born:—
In electricity, Mons. Losmond has made a remarkable discovery. You write two or three words on a paper; he takes it with him into a room, and turns a machine enclosed in a cylindrical case, at the top of which is an electrometer, in the shape of a small fine pith ball. A wire connects with a similar cylinder and electrometer in a distant apartment, and his wife, by remarking the corresponding motions of the ball, writes down the words they indicate, from which it appears that he has formed an alphabet of motions. As the length of wire makes no difference in the effect, a correspondence might be carried on at any distance, within and without a besieged town, for instance, or for a purpose much more worthy and a thousand times more harmless, between two lovers, prohibited or prevented from any better epistolary intercourse.
A second edition of Mr. Young’s Tour was published in quarto in 1794, and the above extract may be found on page 79, volume i.