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drums revolve in opposite directions。 Because of the fact that a cable's inevitable enemy is moisture； each cable is wound on an immense spool and rolled into an oven until it is as dry as a cinder。 Then it is put into a strait…jacket of lead pipe； sealed at both ends； and trundled into a waiting freight car。
No other company uses so much wire and hard rubber； or so many tons of brass rods； as the Western Electric。 Of platinum； too； which is more expensive than gold； it uses one thousand pounds a year in the making of telephone transmitters。 This is imported from the Ural Mountains。 The silk thread comes from Italy and Japan； the iron for magnets； from Norway； the paper tape； from Manila； the mahogany； from South America； and the rubber； from Brazil and the valley of the Congo。 At least seven countries must cooperate to make a telephone message possible。
Perhaps the most extraordinary feature in the Western Electric factories is the multitude of its inspectors。 No other sort of manufactur… ing； not even a Government navy…yard； has so many。 Nothing is too small to escape these sleuths of inspection。 They test every tiny disc of mica； and throw away nine out of ten。 They test every telephone by actual talk； set up every switchboard； and try out every cable。 A single transmitter； by the time it is completed； has had to pass three hundred examinations； and a single coin…box is obliged to count ten thousand nickels before it graduates into the outer world。 Seven hundred inspectors are on guard in the two main plants at Chicago and New York。 This is a ruinously large number； from a profit…making point of view； but the inexorable fact is that in a telephone system nothing is insignificant。 It is built on such altruistic lines that an injury to any one part is the concern of all。
As usual； when we probe into the history of a business that has grown great and overspread the earth； we find a Man； and the Western Electric is no exception to this rule。 Its Man； still fairly hale and busy after forty years of leadership； is Enos M。 Barton。 His career is the typical American story of self…help。 He was a telegraph messenger boy in New York during the Civil War； then a telegraph operator in Cleveland。 In 1869 his salary was cut down from one hundred dollars a month to ninety dollars； whereupon he walked out and founded the Western Electric in a shabby little machine…shop。 Later he moved to Chicago； took in Elisha Gray as his partner； and built up a trade in the making of telegraphic materials。
When the telephone was invented； Barton was one of the sceptics。 〃I well remember my disgust；〃 he said； 〃when some one told me it was possible to send conversation along a wire。〃 Several months later he saw a telephone and at once became one of its apostles。 By 1882 his plant had become the official workshop of the Bell Companies。 It was the headquarters of invention and manufacturing。 Here was gathered a notable group of young men； brilliant and adventurous； who dared to stake their futures on the success of the telephone。 And always at their head was Barton； as a sort of human switchboard； who linked them all together and kept them busy。
In appearance； Enos M。 Barton closely resembles ex…President Eliot； of Harvard。 He is slow in speech； simple in manner； and with a rare sagacity in business affairs。 He was not an organizer； in the modern sense。 His policy was to pick out a man； put him in a responsible place； and judge him by results。 Engineers could become bookkeepers； and bookkeepers could become engineers。 Such a plan worked well in the earlier days； when the art of telephony was in the making； and when there was no source of authority on telephonic problems。 Barton is the bishop emeritus of the Western Electric to…day； and the big industry is now being run by a group of young hustlers； with H。 B。 Thayer at the head of the table。 Thayer is a Vermonter who has climbed the ladder of experience from its lower rungs to the top。 He is a typical Yankeelean； shrewd； tireless； and with a cold… blooded sense of justice that fits him for the leadership of twenty…six thousand people。
So； as we have seen； the telephone as Bell invented it； was merely a brilliant beginning in the development of the art of telephony。 It was an elfin birthan elusive and delicate sprite that had to be nurtured into maturity。 It was like a soul； for which a body had to be created； and no one knew how to make such a body。 Had it been born in some less energetic country； it might have remained feeble and undeveloped； but not in the United States。 Here in one year it had become famous； and in three years it had become rich。 Bell's invincible patent was soon buttressed by hundreds of others。 An open… door policy was adopted for invention。 Change followed change to such a degree that the experts of 1880 would be lost to…day in the mazes of a telephone exchange。
The art of the telephone engineer has in thirty years grown from the most crude and clumsy of experiments into an exact and comprehensive profession。 As Carty has aptly said； 〃At first we invariably approached every problem from the wrong end。 If we had been told to load a herd of cattle on a steamer； our method would have been to hire a Hagenbeck to train the cattle for a couple of years； so that they would know enough to walk aboard of the ship when he gave the signal； but to…day； if we had to ship cattle； we would know enough to make a greased chute and slide them on board in a jiffy。〃
The telephone world has now its own standards and ideals。 It has a language of its own； a telephonese that is quite unintelligible to outsiders。 It has as many separate branches of study as medicine or law。 There are few men； half a dozen at most； who can now be said to have a general knowledge of telephony。 And no matter how wise a telephone expert may be； he can never reach perfection； because of the amazing variety of things that touch or concern his profession。
〃No one man knows all the details now；〃 said Theodore Vail。 〃Several days ago I was walking through a telephone exchange and I saw something new。 I asked Mr。 Carty to explain it。 He is our chief engineer； but he did not understand it。 We called the manager。 He did n't know； and called his assistant。 He did n't know； and called the local engineer； who was able to tell us what it was。〃
To sum up this development of the art of tele… phonyto present a bird's…eye viewit may be divided into four periods：
1。 Experiment。 1876 to 1886。 This was the period of invention； in which there were no experts and no authorities。 Telephonic apparatus consisted of makeshifts and adaptations。 It was the period of iron wire； imperfect transmitters； grounded circuits； boy operators； peg switchboards； local batteries； and overhead lines。
2。 Development。 1886 to 1896。 In this period amateurs became engineers。 The proper type of apparatus was discovered； and was improved to a high point of efficiency。 In this period came the multiple switchboard； copper wire； girl operators； underground cables； metallic circuit； common battery； and the long…distance lines。
3。 Expansion。 1896 to 1906。 This was the era of big business。 It was an autumn period； in which the telephone men and the