ÓÑÇéÌáʾ£ºÈç¹û±¾ÍøÒ³´ò¿ªÌ«Âý»òÏÔʾ²»ÍêÕû£¬Çë³¢ÊÔÊó±êÓÒ¼ü¡°Ë¢Ð¡±±¾ÍøÒ³£¡
the history of the telephone-µÚ1²¿·Ö
¿ì½Ý²Ù×÷: °´¼üÅÌÉÏ·½Ïò¼ü ¡û »ò ¡ú ¿É¿ìËÙÉÏÏ·ҳ °´¼üÅÌÉ쵀 Enter ¼ü¿É»Øµ½±¾ÊéĿ¼ҳ °´¼üÅÌÉÏ·½Ïò¼ü ¡ü ¿É»Øµ½±¾Ò³¶¥²¿! Èç¹û±¾ÊéûÓÐÔĶÁÍ꣬ÏëÏ´μÌÐø½Ó×ÅÔĶÁ£¬¿ÉʹÓÃÉÏ·½ "Êղص½ÎÒµÄä¯ÀÀÆ÷" ¹¦ÄÜ ºÍ "¼ÓÈëÊéÇ©" ¹¦ÄÜ£¡
The¡¡History¡¡of¡¡the¡¡Telephone
by¡¡Herbert¡¡N¡£¡¡Casson
PREFACE
Thirty¡five¡¡short¡¡years£»¡¡and¡¡presto£¡¡¡the¡¡newborn¡¡art¡¡of¡¡telephony¡¡is¡¡fullgrown¡£¡¡Three¡¡million¡¡telephones¡¡are¡¡now¡¡scattered¡¡abroad¡¡in¡¡foreign¡¡countries£»¡¡and¡¡seven¡¡millions¡¡are¡¡massed¡¡here£»¡¡in¡¡the¡¡land¡¡of¡¡its¡¡birth¡£
So¡¡entirely¡¡has¡¡the¡¡telephone¡¡outgrown¡¡the¡¡ridicule¡¡with¡¡which£»¡¡as¡¡many¡¡people¡¡can¡¡well¡¡remember£»¡¡it¡¡was¡¡first¡¡received£»¡¡that¡¡it¡¡is¡¡now¡¡in¡¡most¡¡places¡¡taken¡¡for¡¡granted£»¡¡as¡¡though¡¡it¡¡were¡¡a¡¡part¡¡of¡¡the¡¡natural¡¡phenomena¡¡of¡¡this¡¡planet¡£¡¡It¡¡has¡¡so¡¡marvellously¡¡extended¡¡the¡¡facilities¡¡of¡¡conversationthat¡¡¡¨art¡¡in¡¡which¡¡a¡¡man¡¡has¡¡all¡¡mankind¡¡for¡¡competitors¡¨that¡¡it¡¡is¡¡now¡¡an¡¡indispensable¡¡help¡¡to¡¡whoever¡¡would¡¡live¡¡the¡¡convenient¡¡life¡£¡¡The¡¡disadvantage¡¡of¡¡being¡¡deaf¡¡and¡¡dumb¡¡to¡¡all¡¡absent¡¡persons£»¡¡which¡¡was¡¡universal¡¡in¡¡pre¡telephonic¡¡days£»¡¡has¡¡now¡¡happily¡¡been¡¡overcome£»¡¡and¡¡I¡¡hope¡¡that¡¡this¡¡story¡¡of¡¡how¡¡and¡¡by¡¡whom¡¡it¡¡was¡¡done¡¡will¡¡be¡¡a¡¡welcome¡¡addition¡¡to¡¡American¡¡libraries¡£
It¡¡is¡¡such¡¡a¡¡story¡¡as¡¡the¡¡telephone¡¡itself¡¡might¡¡tell£»¡¡if¡¡it¡¡could¡¡speak¡¡with¡¡a¡¡voice¡¡of¡¡its¡¡own¡£¡¡It¡¡is¡¡not¡¡technical¡£¡¡It¡¡is¡¡not¡¡statistical¡£¡¡It¡¡is¡¡not¡¡exhaustive¡£¡¡It¡¡is¡¡so¡¡brief£»¡¡in¡¡fact£»¡¡that¡¡a¡¡second¡¡volume¡¡could¡¡readily¡¡be¡¡made¡¡by¡¡describing¡¡the¡¡careers¡¡of¡¡telephone¡¡leaders¡¡whose¡¡names¡¡I¡¡find¡¡have¡¡been¡¡omitted¡¡unintentionally¡¡from¡¡this¡¡booksuch¡¡indispensable¡¡men£»¡¡for¡¡instance£»¡¡as¡¡William¡¡R¡£¡¡Driver£»¡¡who¡¡has¡¡signed¡¡more¡¡telephone¡¡cheques¡¡and¡¡larger¡¡ones¡¡than¡¡any¡¡other¡¡man£»¡¡Geo¡£¡¡S¡£¡¡Hibbard£»¡¡Henry¡¡W¡£¡¡Pope£»¡¡and¡¡W¡£¡¡D¡£¡¡Sargent£»¡¡three¡¡veterans¡¡who¡¡know¡¡telephony¡¡in¡¡all¡¡its¡¡phases£»¡¡George¡¡Y¡£¡¡Wallace£»¡¡the¡¡last¡¡survivor¡¡of¡¡the¡¡Rocky¡¡Mountain¡¡pioneers£»¡¡Jasper¡¡N¡£¡¡Keller£»¡¡of¡¡Texas¡¡and¡¡New¡¡England£»¡¡W¡£¡¡T¡£¡¡Gentry£»¡¡the¡¡central¡¡figure¡¡of¡¡the¡¡Southeast£»¡¡and¡¡the¡¡following¡¡presidents¡¡of¡¡telephone¡¡companies£º¡¡Bernard¡¡E¡£¡¡Sunny£»¡¡of¡¡Chicago£»¡¡E¡£¡¡B¡£¡¡Field£»¡¡of¡¡Denver£»¡¡D¡£¡¡Leet¡¡Wilson£»¡¡of¡¡Pittsburg£»¡¡L¡£¡¡G¡£¡¡Richardson£»¡¡of¡¡Indianapolis£»¡¡Caspar¡¡E¡£¡¡Yost£»¡¡of¡¡Omaha£»¡¡James¡¡E¡£¡¡Caldwell£»¡¡of¡¡Nashville£»¡¡Thomas¡¡Sherwin£»¡¡of¡¡Boston£»¡¡Henry¡¡T¡£¡¡Scott£»¡¡of¡¡San¡¡Francisco£»¡¡H¡£¡¡J¡£¡¡Pettengill£»¡¡of¡¡Dallas£»¡¡Alonzo¡¡Burt£»¡¡of¡¡Milwaukee£»¡¡John¡¡Kil¡¡¡gour£»¡¡of¡¡Cincinnati£»¡¡and¡¡Chas¡£¡¡S¡£¡¡Gleed£»¡¡of¡¡Kansas¡¡City¡£
I¡¡am¡¡deeply¡¡indebted¡¡to¡¡most¡¡of¡¡these¡¡men¡¡for¡¡the¡¡information¡¡which¡¡is¡¡herewith¡¡presented£»¡¡and¡¡also¡¡to¡¡such¡¡pioneers£»¡¡now¡¡dead£»¡¡as¡¡O¡£¡¡E¡£¡¡Madden£»¡¡the¡¡first¡¡General¡¡Agent£»¡¡Frank¡¡L¡£¡¡Pope£»¡¡the¡¡noted¡¡electrical¡¡expert£»¡¡C¡£¡¡H¡£¡¡Haskins£»¡¡of¡¡Milwaukee£»¡¡George¡¡F¡£¡¡Ladd£»¡¡of¡¡San¡¡Francisco£»¡¡and¡¡Geo¡£¡¡F¡£¡¡Durant£»¡¡of¡¡St¡£¡¡Louis¡£
H¡£¡¡N¡£¡¡C¡£¡¡PINE¡¡HILL£»¡¡N¡£¡¡Y¡££»¡¡June¡¡1£»¡¡1910¡£
CONTENTS
CHAPTER¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡I¡¡¡¡¡¡¡¡THE¡¡BIRTH¡¡OF¡¡THE¡¡TELEPHONE
II¡¡¡¡¡¡THE¡¡BUILDING¡¡OF¡¡THE¡¡BUSINESS
III¡¡¡¡THE¡¡HOLDING¡¡OF¡¡THE¡¡BUSINESS
IV¡¡¡¡¡¡THE¡¡DEVELOPMENT¡¡OF¡¡THE¡¡ART
V¡¡¡¡¡¡¡¡THE¡¡EXPANSION¡¡OF¡¡THE¡¡BUSINESS¡¡
VI¡¡¡¡¡¡NOTABLE¡¡USERS¡¡OF¡¡THE¡¡TELEPHONE¡¡
VII¡¡THE¡¡TELEPHONE¡¡AND¡¡NATIONAL¡¡EFFICIENCY
VIII¡¡THE¡¡TELEPHONE¡¡IN¡¡FOREIGN¡¡COUNTRIES
IX¡¡THE¡¡FUTURE¡¡OF¡¡THE¡¡TELEPHONE
THE¡¡HISTORY¡¡OF¡¡THE¡¡TELEPHONE
CHAPTER¡¡I
THE¡¡BIRTH¡¡OF¡¡THE¡¡TELEPHONE
In¡¡that¡¡somewhat¡¡distant¡¡year¡¡1875£»¡¡when¡¡the¡¡telegraph¡¡and¡¡the¡¡Atlantic¡¡cable¡¡were¡¡the¡¡most¡¡wonderful¡¡things¡¡in¡¡the¡¡world£»¡¡a¡¡tall¡¡young¡¡professor¡¡of¡¡elocution¡¡was¡¡desperately¡¡busy¡¡in¡¡a¡¡noisy¡¡machine¡shop¡¡that¡¡stood¡¡in¡¡one¡¡of¡¡the¡¡narrow¡¡streets¡¡of¡¡Boston£»¡¡not¡¡far¡¡from¡¡Scollay¡¡Square¡£¡¡It¡¡was¡¡a¡¡very¡¡hot¡¡afternoon¡¡in¡¡June£»¡¡but¡¡the¡¡young¡¡professor¡¡had¡¡forgotten¡¡the¡¡heat¡¡and¡¡the¡¡grime¡¡of¡¡the¡¡workshop¡£¡¡He¡¡was¡¡wholly¡¡absorbed¡¡in¡¡the¡¡making¡¡of¡¡a¡¡nondescript¡¡machine£»¡¡a¡¡sort¡¡of¡¡crude¡¡harmonica¡¡with¡¡a¡¡clock¡spring¡¡reed£»¡¡a¡¡magnet£»¡¡and¡¡a¡¡wire¡£¡¡It¡¡was¡¡a¡¡most¡¡absurd¡¡toy¡¡in¡¡appearance¡£¡¡It¡¡was¡¡unlike¡¡any¡¡other¡¡thing¡¡that¡¡had¡¡ever¡¡been¡¡made¡¡in¡¡any¡¡country¡£¡¡The¡¡young¡¡professor¡¡had¡¡been¡¡toiling¡¡over¡¡it¡¡for¡¡three¡¡years¡¡and¡¡it¡¡had¡¡constantly¡¡baffled¡¡him£»¡¡until£»¡¡on¡¡this¡¡hot¡¡afternoon¡¡in¡¡June£»¡¡1875£»¡¡he¡¡heard¡¡an¡¡almost¡¡inaudible¡¡sounda¡¡faint¡¡TWANGcome¡¡from¡¡the¡¡machine¡¡itself¡£
For¡¡an¡¡instant¡¡he¡¡was¡¡stunned¡£¡¡He¡¡had¡¡been¡¡expecting¡¡just¡¡such¡¡a¡¡sound¡¡for¡¡several¡¡months£»¡¡but¡¡it¡¡came¡¡so¡¡suddenly¡¡as¡¡to¡¡give¡¡him¡¡the¡¡sensation¡¡of¡¡surprise¡£¡¡His¡¡eyes¡¡blazed¡¡with¡¡delight£»¡¡and¡¡he¡¡sprang¡¡in¡¡a¡¡passion¡¡of¡¡eagerness¡¡to¡¡an¡¡adjoining¡¡room¡¡in¡¡which¡¡stood¡¡a¡¡young¡¡mechanic¡¡who¡¡was¡¡assisting¡¡him¡£
¡¨Snap¡¡that¡¡reed¡¡again£»¡¡Watson£»¡¨¡¡cried¡¡the¡¡apparently¡¡irrational¡¡young¡¡professor¡£¡¡There¡¡was¡¡one¡¡of¡¡the¡¡odd¡looking¡¡machines¡¡in¡¡each¡¡room£»¡¡so¡¡it¡¡appears£»¡¡and¡¡the¡¡two¡¡were¡¡connected¡¡by¡¡an¡¡electric¡¡wire¡£¡¡Watson¡¡had¡¡snapped¡¡the¡¡reed¡¡on¡¡one¡¡of¡¡the¡¡machines¡¡and¡¡the¡¡professor¡¡had¡¡heard¡¡from¡¡the¡¡other¡¡machine¡¡exactly¡¡the¡¡same¡¡sound¡£¡¡It¡¡was¡¡no¡¡more¡¡than¡¡the¡¡gentle¡¡TWANG¡¡of¡¡a¡¡clock¡spring£»¡¡but¡¡it¡¡was¡¡the¡¡first¡¡time¡¡in¡¡the¡¡history¡¡of¡¡the¡¡world¡¡that¡¡a¡¡complete¡¡sound¡¡had¡¡been¡¡carried¡¡along¡¡a¡¡wire£»¡¡reproduced¡¡perfectly¡¡at¡¡the¡¡other¡¡end£»¡¡and¡¡heard¡¡by¡¡an¡¡expert¡¡in¡¡acoustics¡£
That¡¡twang¡¡of¡¡the¡¡clock¡spring¡¡was¡¡the¡¡first¡¡tiny¡¡cry¡¡of¡¡the¡¡newborn¡¡telephone£»¡¡uttered¡¡in¡¡the¡¡clanging¡¡din¡¡of¡¡a¡¡machine¡shop¡¡and¡¡happily¡¡heard¡¡by¡¡a¡¡man¡¡whose¡¡ear¡¡had¡¡been¡¡trained¡¡to¡¡recognize¡¡the¡¡strange¡¡voice¡¡of¡¡the¡¡little¡¡newcomer¡£¡¡There£»¡¡amidst¡¡flying¡¡belts¡¡and¡¡jarring¡¡wheels£»¡¡the¡¡baby¡¡telephone¡¡was¡¡born£»¡¡as¡¡feeble¡¡and¡¡helpless¡¡as¡¡any¡¡other¡¡baby£»¡¡and¡¡¡¨with¡¡no¡¡language¡¡but¡¡a¡¡cry¡£¡¨
The¡¡professor¡inventor£»¡¡who¡¡had¡¡thus¡¡rescued¡¡the¡¡tiny¡¡foundling¡¡of¡¡science£»¡¡was¡¡a¡¡young¡¡Scottish¡¡American¡£¡¡His¡¡name£»¡¡now¡¡known¡¡as¡¡widely¡¡as¡¡the¡¡telephone¡¡itself£»¡¡was¡¡Alexander¡¡Graham¡¡Bell¡£¡¡He¡¡was¡¡a¡¡teacher¡¡of¡¡acoustics¡¡and¡¡a¡¡student¡¡of¡¡electricity£»¡¡possibly¡¡the¡¡only¡¡man¡¡in¡¡his¡¡generation¡¡who¡¡was¡¡able¡¡to¡¡focus¡¡a¡¡knowledge¡¡of¡¡both¡¡subjects¡¡upon¡¡the¡¡problem¡¡of¡¡the¡¡telephone¡£¡¡To¡¡other¡¡men¡¡that¡¡exceedingly¡¡faint¡¡sound¡¡would¡¡have¡¡been¡¡as¡¡inaudible¡¡as¡¡silence¡¡itself£»¡¡but¡¡to¡¡Bell¡¡it¡¡was¡¡a¡¡thunder¡clap¡£¡¡It¡¡was¡¡a¡¡dream¡¡come¡¡true¡£¡¡It¡¡was¡¡an¡¡impossible¡¡thing¡¡which¡¡had¡¡in¡¡a¡¡flash¡¡become¡¡so¡¡easy¡¡that¡¡he¡¡could¡¡scarcely¡¡believe¡¡it¡£¡¡Here£»¡¡without¡¡the¡¡use¡¡of¡¡a¡¡battery£»¡¡with¡¡no¡¡more¡¡electric¡¡current¡¡than¡¡that¡¡made¡¡by¡¡a¡¡couple¡¡of¡¡magnets£»¡¡all¡¡the¡¡waves¡¡of¡¡a¡¡sound¡¡had¡¡been¡¡carried¡¡along¡¡a¡¡wire¡¡and¡¡changed¡¡back¡¡to¡¡sound¡¡at¡¡the¡¡farther¡¡end¡£¡¡It¡¡was¡¡absurd¡£¡¡It¡¡was¡¡incredible¡£¡¡It¡¡was¡¡something¡¡which¡¡neither¡¡wire¡¡nor¡¡electricity¡¡had¡¡been¡¡known¡¡to¡¡do¡¡before¡£¡¡But¡¡it¡¡was¡¡true¡£
No¡¡discovery¡¡has¡¡ever¡¡been¡¡less¡¡accidental¡£¡¡It¡¡was¡¡the¡¡last¡¡link¡¡of¡¡a¡¡long¡¡chain¡¡of¡¡discoveries¡£¡¡It¡¡was¡¡the¡¡result¡¡of¡¡a¡¡persistent¡¡and¡¡deliberate¡¡search¡£¡¡Already£»¡¡for¡¡half¡¡a¡¡year¡¡or¡¡longer£»¡¡Bell¡¡had¡¡known¡¡the¡¡correct¡¡theory¡¡of¡¡the¡¡telephone£»¡¡but¡¡he¡¡had¡¡not¡¡realized¡¡that¡¡the¡¡feeble¡¡undulatory¡¡current¡¡generated¡¡by¡¡a¡¡magnet¡¡was¡¡strong¡¡enough¡¡for¡¡the¡¡transmission¡¡of¡¡speech¡£¡¡He¡¡had¡¡been¡¡taught¡¡to¡¡undervalue¡¡the¡¡incredible¡¡efficiency¡¡of¡¡electricity¡£
Not¡¡only¡¡was¡¡Bell¡¡himself¡¡a¡¡teacher¡¡of¡¡the¡¡laws¡¡of¡¡speech£»¡¡so¡¡highly¡¡skilled¡¡that¡¡he¡¡was¡¡an¡¡instructor¡¡in¡¡Boston¡¡University¡£¡¡His¡¡father£»¡¡also£»¡¡his¡¡two¡¡brothers£»¡¡his¡¡uncle£»¡¡and¡¡his¡¡grandfather¡¡had¡¡taught¡¡the¡¡laws¡¡of¡¡speech¡¡in¡¡the¡¡universities¡¡of¡¡Edinburgh£»¡¡Dublin£»¡¡and¡¡London¡£¡¡For¡¡three¡¡generations¡¡the¡¡Bells¡¡had¡¡been¡¡professors¡¡of¡¡the¡¡science¡¡of¡¡talking¡£¡¡They¡¡had¡¡even¡¡helped¡¡to¡¡create¡¡that¡¡science¡¡by¡¡several¡¡inven¡¡¡tions¡£¡¡The¡¡first¡¡of¡¡them£»¡¡Alexander¡¡Bell£»¡¡had¡¡invented¡¡a¡¡system¡¡for¡¡the¡¡correction¡¡of¡¡stammering¡¡and¡¡similar¡¡defects¡¡of¡¡speech¡£¡¡The¡¡second£»¡¡Alexander¡¡Melville¡¡Bell£»¡¡was¡¡the¡¡dean¡¡of¡¡British¡¡elocutionists£»¡¡a¡¡man¡¡of¡¡creative¡¡brain¡¡and¡¡a¡¡most¡¡impressive¡¡facility¡¡of¡¡rhetoric¡£¡¡He¡¡was¡¡the¡¡author¡¡of¡¡a¡¡dozen¡¡text¡books¡¡on¡¡the¡¡art¡¡of¡¡speaking¡¡correctly£»¡¡and¡¡also¡¡of¡¡a¡¡most¡¡ingenious¡¡sign¡language¡¡which¡¡he¡¡called¡¡¡¨Visible¡¡Speech¡£¡¨¡¡Every¡¡letter¡¡in¡¡the¡¡alphabet¡¡of¡¡this¡¡language¡¡represented¡¡a¡¡certain¡¡action¡¡of¡¡the¡¡lips¡¡and¡¡tongue£»¡¡so¡¡that¡¡a¡¡new¡¡method¡¡was¡¡provided¡¡for¡¡those¡¡who¡¡wished¡¡to¡¡learn¡¡foreign¡¡languages¡¡or¡¡to¡¡speak¡¡their¡¡own¡¡language¡¡more¡¡correctly¡£¡¡And¡¡the¡¡third¡¡of¡¡these¡¡speech¡improving¡¡Bells£»¡¡the¡¡inventor¡¡of¡¡the¡¡telephone£»¡¡inherited¡¡the¡¡peculiar¡¡genius¡¡of¡¡his¡¡fathers£»¡¡both¡¡inventive¡¡and¡¡rhetorical£»¡¡to¡¡such¡¡a¡¡degree¡¡that¡¡as¡¡a¡¡boy¡¡he¡¡had¡¡constructed¡¡an¡¡artificial¡¡skull£»¡¡from¡¡gutta¡percha¡¡and¡¡India¡¡rubber£»¡¡which£»¡¡when¡¡enlivened¡¡by¡¡a¡¡blast¡¡of¡¡air¡¡from¡¡a¡¡hand¡bellows£»¡¡would¡¡actually¡¡pronounce¡¡several¡¡words¡¡in¡¡an¡¡almost¡¡human¡¡manner¡£
The¡¡third¡¡Bell£»¡¡the¡¡only¡¡one¡¡of¡¡this¡¡remarkable¡¡family¡¡who¡¡concerns¡¡us¡¡at¡¡this¡¡time£»¡¡was¡¡a¡¡young¡¡man£»¡¡barely¡¡twenty¡eight£»¡¡at¡¡the¡¡time¡¡when¡¡his¡¡ear¡¡caught¡¡the¡¡first¡¡cry¡¡of¡¡the¡¡telephone¡£¡¡But¡¡he¡¡was¡¡already¡¡a¡¡man¡¡of¡¡some¡¡note¡¡on¡¡his¡¡own¡¡account¡£¡¡He¡¡had¡¡been¡¡educated¡¡in¡¡Edinburgh£»¡¡the¡¡city¡¡of¡¡his¡¡birth£»¡¡and¡¡in¡¡London£»¡¡and¡¡had¡¡in¡¡one¡¡way¡¡and¡¡another¡¡picked¡¡up¡¡a¡¡smattering¡¡of¡¡anatomy£»¡¡music£»¡¡electricity£»¡¡and¡¡telegraphy¡£¡¡Until¡¡he¡¡was¡¡sixteen¡¡years¡¡of¡¡age£»¡¡he¡¡had¡¡read¡¡nothing¡¡but¡¡novels¡¡and¡¡poetry¡¡and¡¡romantic¡¡tales¡¡of¡¡Scottish¡¡heroes¡£¡¡Then¡¡he¡¡left¡¡home¡¡to¡¡become¡¡a¡¡teacher¡¡of¡¡elocution¡¡in¡¡various¡¡British¡¡schools£»¡¡and¡¡by¡¡the¡¡time¡¡he¡¡was¡¡of¡¡age¡¡he¡¡had¡¡made¡¡several¡¡slight¡¡discoveries¡¡as¡¡to¡¡the¡¡nature¡¡of¡¡vowel¡sounds¡£¡¡Shortly¡¡afterwards£»¡¡he¡¡met¡¡in¡¡London¡¡two¡¡distinguished¡¡men£»¡¡Alexander¡¡J¡£¡¡Ellis¡¡and¡¡Sir¡¡Charles¡¡Wheatstone£»¡¡who¡¡did¡¡far¡¡more¡¡than¡¡they¡¡ever¡¡knew¡¡to¡¡forward¡¡Bell¡¡in¡¡the¡¡direction¡¡of¡¡the¡¡telephone¡£
Ellis¡¡was¡¡the¡¡president¡¡of¡¡the¡¡London¡¡Philological¡¡Society¡£¡¡Also£»¡¡he¡¡was¡¡the¡¡translator¡¡of¡¡the¡¡famous¡¡book¡¡on¡¡¡¨The¡¡Sensations¡¡of¡¡Tone£»¡¨¡¡written¡¡by¡¡Helmholtz£»¡¡who£»¡¡in¡¡the¡¡period¡¡from¡¡1871¡¡to¡¡1894¡¡made¡¡Berlin¡¡the¡¡world¡centre¡¡for¡¡the¡¡study¡¡of¡¡the¡¡physical¡¡sciences¡£¡¡So¡¡it¡¡happened¡¡that¡¡when¡¡Bell¡¡ran¡¡to¡¡Ellis¡¡as¡¡a¡¡young¡¡enthusiast¡¡and¡¡told¡¡his¡¡experiments£»¡¡Ellis¡¡informed¡¡him¡¡that¡¡Helmholtz¡¡had¡¡
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