More than eighty years ago, Davy first produced and exhibited the arc-light to an admiring and dazzled audience at the Royal Institution; and forty years later, at the same place, Faraday, by means of his memorable experiments in electro-dynamics, laid down the laws on which the modern dynamo-electric machine is founded. Though known at the beginning of the century, the electric light remained little more than a scientific curiosity until within the last ten years, during which period the dynamo-electric machine has been brought to its present perfection, and electric lighting on a large and economical scale thus rendered possible. The first practical incandescent lamps were produced only seven years ago, though the idea of lighting by incandescence dates back some forty years or more; but all attempts to manufacture an efficient lamp were rendered futile by the impossibility of obtaining a perfect vacuum. The year 1881 will long be remembered as that in which electric lighting by incandescence was first shown to be possible and practicable.

The future history of the world will doubtless be founded more or less on the history of scientific progress. No branch of science at present rivals in interest that of electricity, and at no time in the history of the world has any branch of science made so great or so rapid progress as electrical science during the past five years.

And now it may be asked, where are the evidences of this wonderful progress, at least in that branch of electricity which is the subject of the present paper? Quite recently, the wonders of the electric light were in the mouths of every one; while at present, little or nothing is heard about it except in professional quarters. Is the electric light a failure, and are all the hopes that have been placed on it to end in nothing? Assuredly not. The explanation of the present lull in electric lighting is not far to seek; it is due almost solely and entirely to speculation. The reins, so to say, had been taken from the hands of engineers and men of science; the stock-jobbers had mounted the chariot, and the mad gallop that followed has ended in ruin and collapse. Many will remember the electric-light mania several years ago, and the panic that took place among those holding gas shares. The public knew little or nothing about electricity, and consequently nothing was too startling or too ridiculous to be believed. Then came a time of wild excitement and reckless speculation, inevitably followed by a time of depression and ruination. Commercial enterprise was brought to a stand-still; real investors lost all confidence; capital was diverted elsewhere; the innocent suffered, and are still suffering; and the electric light suffered all the blame. The government was forced to step in for the protection of the public; and the result of their legislation is the Electric Lighting Act which authorizes the Board of Trade to grant licenses to Companies and local authorities to supply electricity under certain conditions. These conditions have reference chiefly to the limits of compulsory and permissive supply, the securing of a regular and efficient supply, the safety of the public, the limitation of prices to be charged, and regulations as to inspection and inquiry.

That the electric light has not proved a failure may be gleaned from a rough survey of what has been done during the past two years, in spite of unmerited depression and depreciation. In this country, permanent installations have been established at several theatres in London and the provinces; the Royal Courts of Justice, the Houses of Parliament, Buckingham Palace, Windsor Castle, the Bank of England, and other well-known buildings; while numerous railway stations, hotels, clubs, factories, and private mansions throughout the country, have also adopted the new light either entirely or in part. In addition to this, over forty steamships have been fitted with the electric light during the past year; and the Holborn Viaduct, with its shops and buildings, has been lighted without interruption for the past two years. On the continent, in addition to a large number of factories, private houses and public buildings, numerous theatres at Paris, Munich, Stuttgart, Brunn, Vienna, Berlin, Prague and Milan have been electrically lighted. In New York, an installation of ten thousand lights has been successfully running for the last year or two. Any one wishing to see the electric light to advantage and its suitability to interior decoration, should visit the Holborn Restaurant. This building, with its finely decorated rooms, its architectural beauties, and ornamental designs in the renaissance style, when viewed by the electric light, is without doubt one of the chief sights of London.

The electric light in the form of the well-known powerful and dazzling arc-light is the favorite illuminant for lighting harbors, railway stations, docks, public works, and other large spaces. But it is to the incandescent lamp that one must look par excellence for the “light of the future.” It has been satisfactorily established that lighting by incandescence is as cheap as lighting by gas, provided that it be carried out on an extensive scale.

Very contradictory statements have from time to time been published as to the relative cost of lighting by electricity and gas; and a few remarks on the subject, without entering into detailed figures, will explain much of this discrepancy. These remarks will refer to electric lighting by incandescence.

In the first place, the lighting may be effected in one of three ways—(1) by primary batteries; (2) by dynamo-machines; or (3) by a combination of dynamo machines and secondary batteries. The expense of working with primary batteries is altogether prohibitory, except in the case of very small installations; while secondary batteries have not yet been made a practical success; so that the second method mentioned above is the only one at present in the field. In the second place, a distinction must be made between isolated installations and a general system of lighting from central stations. Up to the present time, nearly all the lighting by electricity has been effected by isolated installations. If every man requiring one hundred or even several hundred lights were to set up his own gas-works and supply himself from them, the cost of lighting by gas would be enormously increased. Hence it is manifestly unfair to compare the cost of electric light obtained from isolated installations with gas obtained from gas-works supplying many thousands of lights; yet this is being constantly done. Central stations supplying at least, say, ten thousand lights, and gas-works on an equal scale, must be compared in order to arrive at a true estimate of the relative cost of electricity and gas. Several such extended installations are now being erected in London and elsewhere. With improved generating apparatus, and above all, with improved lamps, it is confidently anticipated that the electric light will eventually be cheaper than gas. Even if dearer than gas, it will be largely used for lighting dwelling-houses, theatres, concert halls, museums, libraries, churches, shops, showrooms, factories, and ships; while perhaps gas may long hold its own as the poor man’s friend, since it affords him warmth as well as light.

The incandescent light is entirely free from the products of combustion which heat and vitiate the air; it enables us to see pictures and flowers as by daylight; it supports plants instead of poisoning them, and enables many industries to be carried on by night as well as by day. Add to this an almost perfect immunity from danger of fire and no fear of explosion. When it is realized that a gas flame gives out seventeen times as much heat as an incandescent lamp of equal light-giving power, and that an ordinary gas flame vitiates the air as much as the breathing of ten persons, some idea may be formed of the advantage of the electric light from a sanitary point of view. To this may be added absence of injury to books, walls and ceilings. Visitors to the Savoy Theatre in London will doubtless have seen the adaptability of this light for places of public amusement and it is now possible to sit out a play in a cool and pleasant atmosphere without incurring a severe headache. To theatrical managers the light offers in addition unusual facilities for producing spectacular effects, such as the employment of green, red, and white lamps to represent night, morning, and daylight. The freedom from weariness and lassitude after spending an evening in an electrically lighted apartment must be experienced in order to be appreciated. The electric light very readily adapts itself to the interior fittings and decorations of houses and public buildings, and it can be placed in positions where gas could not be used on account of the danger of fire. The old lines of gas-fittings should be avoided as far as possible, and the lights placed singly where required and not “bunched” together. For the lighting of mines, electricity must stand unrivalled, though little has as yet been done in this direction. Its speedy adoption either voluntarily or by Act of Parliament, with the employment of lime cartridges instead of blasting by gunpowder, will in the future render explosions in mines almost an impossibility. In some cases, gas may yet for some time compete with the electric light both in brilliancy and economy; for the electric light has spurred on the gas Companies to the improved lighting of many of our public streets and places.

With the general introduction of electricity for the purpose of lighting comes the introduction of electricity for the production of power; for the same current entering by the same conductors can be used for the production of light or of power, or of both. The same plant at the central stations will supply power by day and light by night, with evident economy. Electricity will thus be used for driving sewing-machines, grinding, mixing, brushing, cleaning, and many other domestic purposes. In many trades requiring the application of power for driving light machinery for short periods, electricity will be of the greatest value, and artisans will have an ever ready source of power at their command in their own homes.

Is electricity to supersede gas altogether? By no means, for gas is destined to play a more important part in the future than it has done in the past. Following close upon the revolution in the production of light comes a revolution in the production of heat for purposes of warming and cooking, and for the production of power. Gas in the future will be largely used not necessarily as an illuminant, but as a fuel and a power producer. When gas is burned in an ordinary gas flame, ninety-five per cent. of the gas is consumed in producing heat, and the remaining five per cent. only in producing light. Gas is far more efficient than raw coal as a heating agent; and it is also far cheaper to turn coal into gas and use the gas in a gas-engine, than to burn the coal directly under the boiler of a steam-engine; for gas-engines are far more economical than steam-engines. Bearing these facts in mind it cannot but be seen that the time is not far distant when, both by rich and poor, gas will be used as the cheapest, most cleanly, and most convenient means for heating and cooking, and raw coal need not enter our houses; also that gas-engines must sooner or later supersede steam-engines, and gas thus be used for driving the machine that produces the electricity. In the case of towns distant not more than, say, fifty miles from a coal-field, the gas-works could with advantage be placed at the colliery, the gas being conveyed to its destination in pipes. Thus, coal need no longer be seen, except at the colliery and the gas-works. With the substitution of gas for coal, as a fuel, will end the present abominable and wasteful production of smoke. When smoke, “blacks,” and noxious gases are thus done away with, life in our most populous towns may become a real pleasure. Trees, grass, and flowers will flourish, and architecture be seen in all its beauty. Personal comfort will be greatly enhanced by the absence of smuts, “pea-soup” fogs, and noxious fumes; and monuments, public buildings, and pictures saved from premature destruction.

The present method of open fires is dirty, troublesome, wasteful, and extravagant. With the introduction of gas as a heating agent, there will be no more carting about of coals and ashes, and no more troublesome lighting of fires with wood, paper, and matches. No more coal-scuttles, no more smoky chimneys, no more chimney sweeps! On the other hand, the old open coal fire is cheerful, “pokable,” and conducive to ventilation; while the Englishman loves to stand in front of it and toast himself. All this, however, may still be secured in the gas stoves of the future, as any one could easily have satisfied himself at the recent Smoke Abatement Exhibition in London. The gas stove of the future must be an open radiating stove, and not a closed stove, which warms the air by conduction and convection chiefly, and renders the air of a room dry and uncomfortable.

It has been frequently pointed out that our coal-fields are not inexhaustible; but they doubtless contain a sufficient supply for hundreds of years to come. Long before the supply is likely to run short, other sources of nature will be largely drawn upon. These are the winds, waterfalls, tides, and the motion of the waves. The two former have to some extent been utilized; but little or nothing has been done or attempted with the latter. Before these can be to any extent made use of, means must be devised for storing energy in the form of electricity; a problem which is now being vigorously attacked, but as yet without much practical success. That electricity has a great future before it cannot for a moment be doubted.—Chambers’s Journal.