Show H story of th L ectal 0 c L ng 0 1 I 1 01 smithsonian smiths onlan institution issues urn leen li pamphlet reviewing the 11 Eari ediest lest experiments in ii i n 1111 IIIi tory story of I 1 hectric ell f i title of a pamphlet lemiel to ro 11 h hf libs 11 onlan institution dealing FOB rota alth ith I 1 I 1 lica ct of almost universal in by ima 1 M I my iny of the lie mention intentions depril d rii it are now in the hu j gin ts national museum in the tho L ni f mini nil and mechanical lent let N at I 1 time there tire about ila U P incandescent scent and about itil axi ia P arc are lamps in ue use in ere 1 h 1 i i I 1 states alone and about nn an la qu anber of incandescent scent lamp 4 lc in in foreign countries thia this worl I 1 I 1 I 1 ie e u bic re of ea electricity as an I 1 U la IL top i it t as made possible ble only by it 11 ettli n nt and experimentation sf at ibro ro I 1 1 it i period of 1 12 years by many men f many nationalities origin of electricity L ml foll vin ing a brief resume of the cords 1 of electricity and mat L tt allm i beginning with ith the derivation L of f P word electricity from the cheik thord ord for amber electron elek tron and find im r I 1 ini ing otto von Gue electric nu I 1 1 ine itie of 1030 1650 a ball of sulphur pi MAN I 1 against the hand the first con W denar made by von kleist bishop of ry in 1745 and later known ne as t L he the I 1 ie e den jar from the repetition of bis til at tho the university of r io lolan len and the accidental descove discovery ry of animal electricity in 1783 by lull luigi A I 1 the important work of M 1 l i es sandro volta a proffesor profesor sor of physics in tho lie university of pavia Is 13 taken up volta discovered that electricity fould could bp be generated by chemical means r and nd in 1799 1709 ninde a pile of silver and tine dickt with cloth cloths wet with salt unter anter between them 11 the first use of electricity li as nn an I 1 illuminant wae was anade two year years later I 1 t t sir day daiy who nho demon tr flint electric current can heat flirt t D nn an I 1 strips of metal to incan fl d tr etive and gle light experiments of oersted the next step in electrical knowl f dee ize takes us out of englard and into Diri mirl and I 1 rance chere here he the ex of linns itans christian oersted a professor of physics in the rity of and of andre marie ampere in paris parts led in 1820 to the discovery by the latter that electric current flowing through a colled coiled wire gives it the property of ft it magnet the ampere the unit of flow of electric current Is named in his honor next iaria claims our attention lon biere georg simon ohm the son of a poor blacksmith and a teacher in he the high school at cologne in 1825 discovered the relation between voltage amperage and resistance in an electric circuit which Is called ohms law the ohm the unit of electric resistance ts Is named tor for him from 1825 1823 to 1879 expert experimentation in ent atlon waa and various merely touch me h ing on the outstanding features of this described in detail in the pamphlet let there may be mentioned the discovery of the principle of the dynamo bv by sir michael farady the demonstration of an art experimental in candescent lamp in which a qua wire was made incandescent by sir viliam VII Iam robert grove the first patent on an incandescent lamp in which powdered charcoal operated in an exhausted glass globe obtained by frederick de the first commercial installation of en an electric light made in an english lighthouse in 1862 the invention of the self excited dynamo by sir charles wheatstone and the invention of the electric candle are rc light commercially used tor for light ing the boulevards of garfs by paul Jab lochkoff edison takee takes up study when edison first began the study of the incandescent light la im 1879 there were several commercially established arc are light systems in we use in lie the united states all these items operated on the serles ee rica I 1 system and there were no mean means by which one lamp could be turned on or oft off without doing the nine with all the others on the cir cult edison realized that while this was satisfactory for street lighting where area arcs were generally used it never would be commercial for household lighting after many experiments edison was successful and in 1870 he made a dynamo which root met every requirement qui rement and in the fame same year a carbon lamp in which the filament con sisceil of a carbonized piece of ordinary ahrend on october 21 1879 current was turned into the lamp and it lasted 45 43 hours before it failed A patent was applied tor for on november 4 of that year and granted january 27 1880 |