Electric light

The terminal of the peroxide plates, being the positive pole of the accumulator, is painted red, and that of the spongy plates, or negative pole, black.

Accumulators of this kind are highly useful as reservoirs of electricity for maintaining the electric light or working electric motors in tramcars, boats, and other carriages.

End of chapter 2.

Chapter 3 of The Story of Electricity.

A sensitive pile is also a delicate detector of heat by virtue of the current set up, which can be measured with a galvanometer or current meter.

Piles of antimony and bismuth are made which can indicate the heat of a lighted match at a distance of several yards, and even the radiation from certain of the stars.

Thermobatteries have been used in France for working telegraphs, and they are capable of supplying small installations of the electric light or electric motors for domestic purposes.

The action of the thermopile, like that of a voltaic cell, can be reversed.

This got him invited to Paris to work for Edison's French subsidiary.

In Paris, he was working on making the fabled gas lamp City of Light one of Electric Light.

Success in Paris eventually got Tesla invited to America to work on improving the electric dynamos Thomas Edison was developing in New York City.

Through all of this, Tesla was still independently working on his AC motor.

When the time has expired, the clockwork cuts off the communication and another coin is needed to restart the machinery and renew the conversation.

same plan is adopted in Paris by what is called the theater phone company on inserting a coin a person is put in communication with a theater or concert for a given time on paying a certain fixed sum persons are allowed to hear the whole performance telephonic communication may be established under water as well as over land some of our light ships are now connected with lifeboat stations in this way recently a lifeboat was summoned to assist a stranded vessel before the boat was launched a second message arrived saying that the craft had got off into deep water this saved the hardy crew a night's needless exposure those who have not had the pleasure of holding a conversation by means of the telephone often ask if it is possible to recognise the voice of the speaker certainly as the following incident will show gentleman who lived out of town one day lost his dog when he was in the city and had to return home without him a short time after his arrival he was informed by the telephone that the dog had turned up at a friend's office where he had called that day keep jack said the gentleman till i come tomorrow the dog was standing by the city friend during the conversation and hearing his name uttered in his master's voice began to wag his tail and look about for the speaker he then sat down and could scarcely be persuaded to stir from the spot as if he were expecting his master to step out of the telephone far can the voice be carried by means of the telephone is also a very interesting question the distance depends upon the nature of the conductor and the perfection of the electric current which passes over it given all the conditions required we may say that there would be no limit to the distance over which a telephone would be workable in the first place there is no such thing as an absolutely perfect conductor which offers no resistance to the passage of electricity and the greater the distance the feebler the current becomes then again there is no such thing as a perfect non-conductor no matter what materials are used some of the electricity escapes by the way induction is also another serious barrier to telephonic communication over long distances that is all electric currents are more or less influenced by the currents which are passing over other wires near them in this country there are so many wires for the telephone the telegraph and the electric light that induction takes place to a very considerable extent so far the greatest distance over which conversation has been carried on by means of iron wires is two hundred and fifty miles and by a compound wire of steel and copper a little over one thousand miles chapter ten CHAPTER XI.

OF THE STORY OF EDISON AND THE WONDERS OF ELECTRICITY by Frank Mundell.

This LibriVox recording is in the public domain.

Here is one which shows a use not contemplated by the inventor.

Recently a man was suddenly afflicted with paralysis.

there was no hope of his recovery and he was very much concerned to think that he had not made his will his hands were powerless to hold the pen but he could speak a phonograph was brought and the dying man spoke what he would have written and left his will recorded on the cylinder how far such a disposition of property was legal we do not know but surely it would be as easy to prove a man's voice as his handwriting embalming the living voice and reproducing it after death is both interesting and pathetic this was illustrated at the funeral of an american singer when she had been laid in the grave her friends assembled to hear her favourite hymn nearer my god to thee she had sung it into the instrument a few weeks before she died one of the later stories of the sound writer is told by colonel he says one of mr edison's assistants being some distance from home was accustomed to communicate with his family by the assistance of the phonograph he spoke his thoughts into the phonograph took out the wax cylinder on which his words were impressed and posted it home on its arrival it was placed in the phonograph the machine set revolving and the message came forth the absentee had a favourite dog to which he was much attached in one of his phonograms he sent his love to the dog finishing with a whistle the dog was lying quietly on the hearth while the message was being read but when the whistle came forth he jumped up bounding all over the room and out at the door to look for the master whose signal they had heard we have heard enough to show that all sounds are alike faithfully recorded by the phonograph nor could it be otherwise seeing that the record consists of a phonogram of the sound waves no sound is so low that it cannot be written down and none so loud that it is beyond the compass of the instrument even the mighty roar of niagara falls has been recorded and is daily produced far away from the spot where the great river leaps over massive cliffs chapter chapter fourteen of the story of edison and the wonders of electricity by frank mundell the electric light and now we have to deal with another modern wonder which edison did not invent but as it is in the direct product of electricity it has come under the marvellous influence of the nineteenth century wizard this is the electric light the phonograph is perhaps the most startling of edison's inventions and the one that gives the most unexpected results but the electric light is beyond all question the beginning of a new order of things in illuminating Sir Humphry Davy, the inventor of the miner's safety lamp, which, however, did not contain the electric light, was the first to call the attention of the world to this means of illumination in 1810.

It was not then put to any practical use on account of the great expense and the numerous difficulties which attended its production.

So it was a very big, very big factory.

There was the Electric Light and Milling Company came around a little bit later.

WH Fredenberg had the roller mills.

So that's the roller mills first were invented around 1860.