The Romance of Industry and Invention Part 15

In 1895 the number of telegraph offices at post-offices was 7409, in addition to 2252 at railway stations, or a grand total of 9661. The number of ordinary inland messages sent during the year was 71,589,064.

In regard to the great increase of pace in the transmission of telegraphic messages, Mr Baines tells us that, 'looking back fifty years, we see wires working at the rate of eight words a minute, or an average of four words per wire per minute, over relatively short distances. Now, there is a potentiality of 400 words--nay, even 600 or 700 words--per wire per minute, over very long distances. As the invention of duplex working has been supplemented by the contrivances for multiplex working (one line sufficing to connect several different offices in one part of the country with one or more offices in another part), it is almost impossible to put a limit to the carrying capacity of a single wire.' In 1866 the time occupied in sending a telegram between London and Bournemouth was two hours, and between Manchester and Bolton, two hours and a quarter; while in 1893 the times occupied were ten minutes and five minutes respectively.

Press telegrams have enormously increased in number and length since the purchase of the telegraph system by the State. When the companies owned the wires, the news service from London to the provinces was ordinarily not more than a column of print a night. At the present time the news service of the Press a.s.sociation alone over the Post-office wires to papers outside the metropolis averages fully 500 columns nightly. Since 1870 this a.s.sociation has paid the Post-office 750,000 for telegraphic charges, and in addition to this, very large sums have been paid by the London and provincial daily papers for the independent transmission of news, and by the princ.i.p.al journals in the country for the exclusive use, during certain hours, of 'special wires.' Some of the leading papers in the provinces receive ten or more columns of specially telegraphed news on nights when important matters are under discussion in Parliament; and from this some idea may be formed of the amount of business now transacted between the Press and the Telegraph Department.

THE TELEPHONE.

So much have times altered in the last fifty years, that the electric telegraph itself, which now reaches its thin arms into more than six thousand offices, is threatened in its turn with serious rivalry at the hands of a youthful but vigorous compet.i.tor, the telephone. Its advantages are such that its ultimate popularity cannot be a matter of doubt. It is no small benefit to be able to recognise voices, to transact business with prompt.i.tude by word of mouth, to get a reply, 'Yes' or 'No,' on the spot, instead of having to rush to the nearest telegraph office.

Great inventions are often conceived a long time before they are realised in practice. Sometimes the original idea occurs to the man who subsequently works it out; and sometimes it comes as a happy thought to one who is either in advance of his age, or who is prevented by adverse circ.u.mstances from following it up, and who yet lives to see the day when some more fortunate individual gives it a material shape, and so achieves the fame which was denied to him. Such is the case of M.

Charles Bourselle, who in 1854 proposed a form of speaking-telephone, which, although not practicable in its first crude condition, might have led its originator to a more successful instrument if he had pursued the subject further.

The telephone is an instrument designed to reproduce sounds at a distance by means of electricity. It was believed by most people, and even by eminent electricians, that the speaking-telephone had never been dreamed of by any one before Professor Graham Bell introduced his marvellous little apparatus to the scientific world. But that was a mistake. More than one person had thought of such a thing, Bourselle among the number. Philip Reis, a German electrician, had even constructed an electric telephone in 1864, which transmitted words with some degree of perfection; and the a.s.sistant of Reis a.s.serts that it was designed to carry music as well as words. Professor Bell, in devising his telephone, copied the human ear with its vibrating drum. The first iron plate he used as a vibrator was a little piece of clock-spring glued to a parchment diaphragm, and on saying to the spring on the telephone at one end of the line: 'Do you understand what I say?' the answer from his a.s.sistant at the other end came back immediately: 'Yes; I understand you perfectly.' The sounds were feeble, and he had to hold his ear close to the little piece of iron on the parchment, but they were distinct; and though Reis had transmitted certain single words some ten years before, Bell was the first to make a piece of matter utter sentences. Reis gave the electric wire a tongue so that it could mumble like an infant; but Bell taught it to speak.

The next step is attributed to Mr Elisha Gray of Chicago, who sent successions of electrical current of varying strength as well as of varying frequency into the circuit, and thus enabled the relative loudness as well as the pitch of sounds to be transmitted; and who afterwards took the important step of using the variations of a steady current. These variations, positive and negative, are capable of representing all the back-and-fore variations of position of a particle of air, however irregular these may be: and he secured them by making the sound-waves set a diaphragm in vibration. This diaphragm carried a metallic point which dipped in dilute sulphuric acid; the deeper it dipped the less was the resistance to a current pa.s.sing through the acid, and _vice versa_: so that every variation in the position of the diaphragm produced a corresponding variation in the intensity of the current: and the varying current acted upon a distant electro-magnet, which accordingly fluctuated in strength, and in its attraction for a piece of soft iron suspended on a flexible diaphragm: this piece of soft iron accordingly oscillated, pulling the flexible diaphragm with it; and the variations of pressure in the air acted upon by the diaphragm produced waves, reproducing the characteristics of the original sound-waves, and perceived by the ear as reproducing the original sound or voice. Mr Gray lodged a _caveat_ for this contrivance in the United States Patent Office on 14th February 1876; but on the same day Professor Alexander Graham Bell filed a specification and drawings of the original Bell telephone.

Bell's telephone was first exhibited in America at the Centennial Exhibition in Philadelphia in 1876; and in England, at the Glasgow meeting of the British a.s.sociation in September of that year. On that occasion, Sir William Thomson (now Lord Kelvin) p.r.o.nounced it, with enthusiasm, to be the 'greatest of all the marvels of the electric telegraph.' The surprise created by its first appearance was, however, nothing to the astonishment and delight which it aroused in this country when Professor Bell, the following year, himself exhibited it in London to the Society of Telegraph Engineers. Since then, its introduction as a valuable aid to social life has been very rapid, and the telephone is now to be found in use from China to Peru.

THOMAS ALVA EDISON AND THE PHONOGRAPH.

The Phonograph is an instrument for mechanically recording and reproducing articulate human speech, song, &c. It was invented by Mr T.

A. Edison in the spring of 1877, at his Menlo Park Laboratory, New Jersey, and came into existence as the result of one of the many lines of experiment he was then engaged upon.

Thomas Alva Edison, this notable American inventor, was born at Milan, Ohio, 11th February 1847, but his early years were spent at Port Huron, Michigan. His father was of Dutch, and his mother of Scotch descent; the latter, having been a teacher, gave him what schooling he received.

Edison was a great reader in his youth, and at the age of twelve he became a newsboy on the Grand Trunk Line running into Detroit, and began to experiment in chemistry. Gaining the exclusive right of selling newspapers on this line, and purchasing some old type, with the aid of four a.s.sistants he printed and issued the _Grand Trunk Herald_, the first newspaper printed in a railway train. A station-master, in grat.i.tude for his having saved his child from the front of an advancing train, taught him telegraphy, in which he had previously been greatly interested; and thenceforward he concentrated the energies of a very versatile mind chiefly upon electrical studies.

[Ill.u.s.tration: Edison with his Phonograph.]

Edison invented an automatic repeater, by means of which messages could be sent from one wire to another without the intervention of the operator. His system of duplex telegraphy was perfected while a telegraph operator in Boston, but was not entirely successful until 1872. In 1871 he became superintendent of the New York Gold and Stock Company, and here invented the printing-telegraph for gold and stock quotations, for the manufacture of which he established a workshop at Newark, N.J., continuing there till his removal to Menlo Park, N.J., in 1876. Ten years later he settled at Orange, at the foot of the Orange Mountains, his large premises at Menlo Park having grown too small for him.

His inventive faculties now getting full play, he took out over fifty patents in connection with improvements in telegraphy, including the duplex, quadruplex, and s.e.xtuplex system; the carbon telephone transmitter; microtasimeter; aerophone, for amplifying sound; the megaphone, for magnifying sound. Thence also emanated his phonograph, a form of telephone, and various practical adaptations of the electric light. His kinetoscope (1894) is a development of the Zoetrope, in which the continuous picture is obtained from a swift succession of instantaneous photographs (taken 46 or more in a second), and printed on a strip of celluloid. Of late he has devoted himself to improving metallurgic methods. He has taken out some 500 patents, and founded many companies at home and in Europe.

Following up some of his telegraphic inventions, he had developed a machine which, by reason of the indentations made on paper, would transfer a message in Morse characters from one circuit to another automatically, through the agency of a tracing-point connected with a circuit-closing device. Upon revolving with rapidity the cylinder that carried the indented or embossed paper Mr Edison found that the indentations could be reproduced with immense rapidity through the vibration of the tracing-point. He at once saw that he could vibrate a diaphragm by the sound-waves of the voice, and, by means of a stylus attached to the diaphragm, make them record themselves upon an impressible substance placed on the revolving cylinder. The record being made thus, the diaphragm would, when the stylus again traversed the cylinder, be thrown into the same vibrations as before, and the actual reproduction of human speech, or any other sound, would be the result.

The invention thought out in this manner was at once tried, with paraffined paper as the receiving material, and afterwards with tinfoil, the experiment proving a remarkable success, despite the crudity of the apparatus. In 1878 Mr Edison made a number of phonographs, which were exhibited in America and Europe, and attracted universal attention. The records were made in these on soft tinfoil sheets fastened around metal cylinders. For a while Mr Edison was compelled to suspend work on this invention, but soon returned to it and worked out the machine as it exists practically to-day. It occupies about the same s.p.a.ce as a hand sewing-machine. A light tube of wax to slide on and off the cylinder is subst.i.tuted for the tinfoil, which had been wrapped round it, and the indenting stylus is replaced by a minute engraving point. Under the varying pressure of the sound-waves, this point or knife cuts into the tube almost imperceptibly, the wax chiselled away wreathing off in very fine spirals before the edge of the little blade, as the cylinder travels under it. Each cylinder will receive about a thousand words. In the improved machine Mr Edison at first employed two diaphragms in 'spectacle' form, one to receive and the other to reproduce; but he has since combined these in a single efficient attachment. The wax cylinders can be used several hundred times, the machine being fitted with a small paring tool which will shave off the record previously made, leaving a smooth new surface. The machine has also been supplemented by the inventor with an ingenious little electric motor with delicate governing mechanism, so that the phonograph can be operated at any chosen rate of speed, uniformly. This motor derives its energising current either from an Edison-Lalande primary battery, a storage battery, or an electric-light circuit.

The new and perfected Edison phonograph has already gone into very general use, and many thousands are distributed in American business offices, where they facilitate correspondence in a variety of ways. They are also employed by stenographers as a help in the transcription of their shorthand notes. Heretofore these notes have been slowly dictated to amanuenses, but they are now frequently read off to a phonograph, and then written out at leisure. The phonograph is, however, being used for direct stenograph work, and it reported verbatim 40,000 words of discussion at one convention held in 1890, the words being quietly repeated into the machine by the reporter as quickly as they were uttered by the various speakers. A large number of machines are in use by actors, clergymen, musicians, reciters, and others, to improve their elocution and singing. Automatic phonographs are also to be found in many places of public resort, equipped with musical or elocutionary cylinders, which can be heard upon the insertion of a small coin; and miniature phonographs have been applied to dolls and toys. The value of the phonograph in the preservation of dying languages has been perceived too, and records have already been secured of the speech, songs, war-cries, and folklore of American tribes now becoming extinct. It is also worthy of note that several voice records remain of distinguished men, who 'being dead yet speak.' Their tones can now be renewed at will, and their very utterances, faithful in accent and individuality, can be heard again and again through all time.

Improvements are being made in the wholesale reproduction of phonographic cylinders, by electrotyping and other processes; and the machine, in a more or less modified form, is being introduced as a means of furnishing a record of communications through the telephone.

Phonographic clocks, books, and other devices have also been invented by Mr Edison, whose discovery is evidently of a generic nature, opening up a large and entirely new field in the arts and sciences.

THE END.