爱迪生，灯亮了
Edison, The Light Came On
一、一千零九十三张纸后面
托马斯·阿尔瓦·爱迪生一生获得1093项美国专利。单看这个数字，很容易想象一个人不停地把新东西从脑海里取出来。翻开专利背后的记录，却会走进许多人一起工作的房间。
不妨先想象专利纸外面的声音：车床在转，玻璃器皿轻轻碰撞，有人报出一个读数，有人说刚才的接头又坏了。我们习惯把灯泡画在一个人的头顶，发明发生的地方却没有那么安静。
1876年，爱迪生在门洛帕克建立实验室，后来又把工作扩展到西奥兰治。机械师、实验人员和其他助手一起工作。查尔斯·巴彻勒这样的合作者，不是天才伸手时递上一把工具的人，而是判断、制作、发现问题的人。
爱迪生有把问题组织成工作的能力。他寻找资金，把不同本领的人放到能够合作的地方，催促进度，再把尚未解决的问题送回工作台。他也参与具体的试验，不只是站在办公室里为别人的发明签名。
门洛帕克是工业研究实验室的重要先驱，却不必被说成此后所有研究机构唯一的祖先。真正值得看的，是发明渐渐拥有了可以接力的安排：笔记留下来，工具还在，昨天卡住的地方今天可以继续。
“发明工厂”是个有力的比喻，也有边界。工厂不能保证每十天按时生产一次新思想。我们可以组织寻找，却不能预先订购发现；把人聚在一起，不等于把他们变成同一架机器的零件。
二、灯泡后面还有一座城
1879年10月，门洛帕克的研究者把碳化棉线装进抽成真空的玻璃泡，进行了关键试验。那不是后来使用的竹丝。灯持续发亮，研究还没有结束：提高亮度、延长寿命、让下一只也能做得一样好。
爱迪生并非第一个让电发光的人。约瑟夫·斯旺等人有自己的白炽灯工作，不能被写成一排注定失败、等待主角登场的前人。爱迪生和团队的贡献，在于把灯的改进与供电体系一起推进。
可以让一盏灯亮，不等于可以让一条街放心使用。还要有发电设备、线路、开关、电表，有制造和维修的办法。住户不会因为一个想法伟大，就愿意每天晚上亲自替它排查故障。
1882年，纽约珍珠街电站开始供电。实验室里一次值得围观的成功，开始进入办公室和住宅，成为人们希望明晚也照常发生的事。庆祝灯亮以后，还得保证它明晚继续亮。
这里有一种常被忽略的困难。演示只需要在观众面前成功一次，服务却需要在没有观众时也可靠。谁补货，谁处理账单，哪里出了问题找谁，这些看似不浪漫的细节，决定发现能否留在生活里。
所以灯泡既是成果，也是入口。往后望，是许多还没有完成的工作；往前看，是一个只想在晚饭以后读会儿书的人。他未必想认识发明家，但他希望开关按下去以后，不必继续为灯操心。
三、从声音到生意
留声机让这种能力有了另一种形状。1877年，爱迪生的工作使声音能够被记录并再放出来。人已经不在面前，声音却还能回来。这首先是一种让人惊讶的经验，不是一张自动兑现的商业支票。
让新鲜事变成日常，要解决机器怎样制造、录音怎样制作、买回去以后用来做什么。发明人看见一种可能，使用者会提出别的问题；公司、工厂和市场有时接住它，有时把它带到最初没有想到的方向。
电影也如此。爱迪生实验室里，威廉·肯尼迪·劳里·迪克森及团队承担了关键的开发工作。活动电影视镜让一个人从窥孔观看，并不等同于后来影院里的银幕放映。不能把不同设备和许多人的贡献，都压进爱迪生一个名字。
黑玛丽亚摄影棚、影片的制作与销售，让机器周围慢慢长出一种事业。但从相机到观众，中间没有一条不分岔的直线。观看的方式会变，竞争者会进入，专利能保护某些东西，也能被拿来阻挡别人。
爱迪生的特别之处，不是每样东西都是他独自发明，而是他反复推动工作越过演示的终点。不过，这种推动本身也依赖合作者、投资者、工人和顾客。他不是凭一个人的手，把整个世界搬进了市场。
一件东西终于不需要发明者守在旁边，确实是成就。但能自己运转，不等于已经公正、人人可用。谁负担价格，谁得到功劳，谁承担风险，是生意开始以后仍要继续回答的问题。
四、新东西不会替我们回答所有问题
如果把爱迪生放到苏格拉底旁边，两个人的节奏似乎很不同。一个先问，你这句话究竟是什么意思；另一个把装置放到桌上，请你看看它能不能用。这是两种值得比较的动作，不是两种永不相通的人。
做出一件东西，也需要拆掉错误假设；提出一个问题，也常常要建立新的说法。休谟并没有让日常因果判断停止，蒯因的批评也不是宣布任何区别都没有了。把思想家分成只拆不建，把发明家分成只建不问，都太省事。
电灯改变了照明，但煤气灯、煤油灯和蜡烛并没有在某一天整齐退场。线路铺设需要钱和时间，不同地方用得起的东西不同。所谓旧世界被新世界替代，落到生活里，常常是一段很长的并存。
旧行业的从业者也不是自动碎掉的布景。一个技术方向改变，意味着有人要重新学习，有人的店面要关门，有人的夜晚第一次有了稳定照明。同一项进步，可以把不同的人带到不同的位置。
因此，“我有一个更好的”之后，还要问：对谁更好，代价由谁付？照明让人读书，也可能让工厂延长工作时间。机器带来的可能，并不自动决定人们会怎样安排彼此的生活。
爱迪生不必负责此后一切后果，但成功也不能替所有后果盖上好字。新的装置改变了可以做什么；接下来该怎样做，仍然是人的问题。灯亮了，讨论并没有因此结束。
五、电流之争里的人
到了十九世纪八十年代末，供电不只是一个实验问题，也成了公司、投资与公众信任的竞争。爱迪生一方的直流系统，面对威斯汀豪斯等人推广的交流系统。特斯拉的多相电机及相关工作是其中的重要部分，不是全部交流电的起点。
当时交流电能借助变压器方便地改变电压，给较远距离的输电带来优势。直流不是另一种比较差的电，更不是由爱迪生创造的自然现象。现代高压直流也有用途；要比较的是具体时代、具体用途里的系统。
安全问题并非凭空捏造。高压线路确实会致命，城市需要监管。爱迪生既有安全方面的判断，也有自己的商业利益；不能替他宣布心里只有一种动机。问题是，人们真实的恐惧会不会被用来给竞争者贴上一张死亡标签。
哈罗德·布朗推动的动物电击实验及电刑活动，与爱迪生方面的支持发生了联系。爱迪生也参与了关于电刑的证言。分清由谁做了什么，不是替他开脱，而是使批评落在有证据的地方，而非把所有残酷故事都集中给一个人。
把危险展示给公众，和借危险制造有利于自己的印象，不是一回事。如果实验的舞台已经替观众安排好唯一的结论，安全就可能变成营销。被用于演示的生命，也不能只算进宣传效果而不算进代价。
这段经历刺人的地方，不是一个发明家在技术竞争中没有永远获胜。是一个很会让事物工作的人，也可能让名声和利益挤进判断。曾经成功的系统，不能因此要求世界永远照着它的接线方式来。
六、汗水也需要判断
关于爱迪生，我们太熟悉“百分之一”与“百分之九十九”的说法。它可以提醒人别只等待灵感，却不该被解释成思想无用，只要把所有材料试完，答案自然就会出现。
你不可能试遍所有东西。选择试哪一种材料，决定比较什么，辨认失败来自灯丝还是漏气，都需要判断。实验室的计算、记录与手艺不是灵感的敌人，而是把一个猜想变成可以追查、可以修改的工作的办法。
一次失败若只留下“没成功”，下一次很可能重来。若记下条件、变化和结果，别人就能接着问：哪里可以不同？这种积累不是苦劳的奖章，而是使后来者不用从同一处黑暗重新出发。
但记录也不能保证商业成功。爱迪生曾把大量资金和多年精力投进铁矿石选矿事业，最终遭遇严重失败。一个知道制造和市场的人，同样可能押错方向，并在已经付出很多以后，仍然不愿停手。
这使坚持成为难题，而非随时适用的口号。今天停下，可能错过明天的突破；今天继续，也可能只是害怕承认昨天的投入无法收回。没有一个固定的百分比，能够替你分清这两种情况。
值得继承的，或许不是永不放弃，而是不让放弃或坚持成为不许追问的身份。让新证据进来，让同事能够说不，让一次停下不等于一个人全盘失败。方法若不能修改自己，也会变成另一道锁。
七、两个人，不是两个半个人
上一篇写特斯拉，这一篇写爱迪生，很容易把他们排成一副整齐的对联：一个代表真理，一个代表市场；一个只有想象，一个只有执行。故事因此好记，两个人却都变薄了。
特斯拉申请专利、寻求投资、与企业合作；爱迪生需要想象，也会计算、推断和改变方案。有人更依赖头脑中的图景，有人更善于把实验组织起来，但不同重心不等于彼此不相容的两种器官。
1917年，特斯拉接受了美国电气工程师学会颁发的爱迪生奖章。名字可以让人感到讽刺，奖项却不是由爱迪生私人主持的一次和解仪式。一个行业也不能简单写成两位名人的私人延长线。
他们更不需要合成一个完整的人。一个人有能力边界，可以寻找合作者；这不表示他只活成了半个人。没有谁必须同时成为发现者、工程师、经理和投资者，才有资格让自己的工作留在世界里。
市场能够提供资源，也可能偏好眼前容易出售的东西；但市场不买账，并不能证明一个方案技术上已经成立。特斯拉的全球无线供电需要工程验证，爱迪生的商业成功也不能替每一种判断作保。
从两人的相遇里，也许最值得带走的不是选边，而是怎样合作：谁能指出问题，谁有权修改目标，功劳怎样分配，离开以后谁还可以继续做事。让不同本领接上，比把两个人铸成永久的敌人更难。
八、名字不在招牌上以后
1892年，爱迪生通用电气与汤姆森—休斯顿合并，组成通用电气。新的名称没有爱迪生，控制与事业的方向也发生了变化。招牌上的变化如此显眼，招牌之外的人生却没有在那一天停住。
爱迪生仍有自己的实验室和其他事业，与电力公司之间也有延续的研究及专利关系。人的生活不随着一家公司的命名结束。他可以失去对某一方向的主导，同时继续在别的方向工作。
这不等于说失去主导无关紧要。一个人花许多年组织起来的事情，后来不再主要听从他的安排，里面可能有失落，也有现实的利益冲突。但我们不能用一个寓言，替他决定所有感受。
倒是这个问题值得留下：如果一种服务终于能靠很多人持续运行，不必等创始人每天点头，它是否也完成了当初希望它进入生活的那一部分？不再事事需要自己，有时正是把事情做成的结果。
同时，能够独立运转不该成为抹去贡献者的借口。记住合作者的名字，公平处理权利和报酬，让退出者不被当成用完的材料，与允许后来者改变旧方案，并不冲突。
爱迪生享受过盛大的荣誉，也经历过失败。他不需要被补写成一个遭世界遗弃的悲剧人物，才配进入这个系列。成功的人也会遇到同一个问题：事情比自己大了以后，怎样继续作为一个人，而不只作为招牌活着。
九、有些灯不能熄灭
1931年10月18日，爱迪生在新泽西州的格兰蒙特去世，八十四岁。关于纪念他的故事里，最动人的一个是熄灯：让人暂时失去熟悉的光，才知道自己已经多么习惯它。
胡佛总统的声明提供了更具体的版本。他建议人们在10月21日的指定时刻，自愿把自己的灯关掉一分钟；却明确反对关闭发电厂，因为医院、供水、消防、电梯等服务不能为致敬而冒险中断。
这个保留，比全国一齐漆黑的传奇更有分量。有些灯必须继续亮着。一个人带来的改变已经进入他人的安全与健康，纪念他，不能把那些正在依靠电的人留在危险里。
现在让爱迪生走上这个系列想象的桥。他拿着一只灯泡，低头看底座。特斯拉在旁边，蒯因暂时合上笔记，波伏瓦把书留在手边。他们没有被一场比赛分成胜者和败者，只是等他把东西接好。
有人递来一段线，有人扶住灯座。爱迪生发现一个接头松了，重新拧紧。这个想象里的小动作，比灯泡凭空在他手中发亮更接近他留下的启发：光要抵达这里，需要不止一双手。
灯亮起来，照到苏格拉底的脸、休谟的棋盘，也照到刚才在阴影里帮忙的人。不是只有举灯者才属于这幅画。没有人需要被缩成一个著名结局，才有资格站在光里。
他们可以让这盏灯暗一会儿，听见桥下的水声。但远处若还有人需要照明，就让远处继续亮着。不必用别人的不便，证明自己的怀念足够郑重。
爱迪生把手从开关旁移开。灯仍然亮着。这一次，不是为了展示他，也不是为了纪念他。只是因为有人还要走过去。
注释
[1] 1879年10月的关键灯丝试验使用碳化棉线，商业用竹丝在后；本文不把早期电灯和供电事业归于一人，也不把活动电影视镜当成影院放映机。迪克森与团队的贡献、铁矿石选矿的商业失败及1892年后延续的研究关系，分别依据档案项目与国家公园史料说明。1093为美国专利数，并非永不被超过的纪录。
[2] 电流之争需区分技术条件、安全顾虑、商业利益及具体参与者；本文不把Topsy大象事件写作爱迪生主持的宣传。百分比名言作为流传的说法讨论，不用“一万次失败”证明具体试验次数。1917年奖章由美国电气工程师学会颁发。1931年胡佛建议个人自愿熄灯，明确反对停发电厂。桥头接灯为文学想象。
I. Behind 1,093 Pieces of Paper
Thomas Alva Edison received 1,093 United States patents. The number invites a picture of one man continuously pulling new things from his head. Open the records behind those patents, however, and you enter rooms where many people are working together.
Imagine the sounds outside those documents: a lathe turning, glass touching glass, somebody reading a measurement, somebody else reporting another broken connection. We draw a bulb above one person's head. The place where invention happens is considerably less silent.
Edison established his Menlo Park laboratory in 1876 and later expanded at West Orange. Machinists, experimenters and other assistants worked together. Collaborators such as Charles Batchelor did more than pass a genius his tools: they made things, exercised judgment and discovered problems.
Edison could turn a question into organised work. He sought funding, brought skills together, pressed for results and sent unfinished problems back to the bench. He also participated in experiments; he was not merely an office-bound signature attached to everybody else's discoveries.
Menlo Park was an important pioneer of industrial research, not the single ancestor from which every later laboratory descended. Its lasting interest lies in making inquiry something people could continue: notebooks remained, equipment was available, yesterday's difficulty could become today's starting point.
The invention factory is a useful image with a limit. A factory cannot guarantee a fresh thought every ten days. We can organise a search without ordering its discoveries in advance. Gathering people together need not turn them into interchangeable parts.
II. A City behind the Bulb
In October 1879, the Menlo Park team conducted crucial tests with carbonised cotton thread inside an evacuated glass bulb. This was not the bamboo used later. Sustained light opened further questions: brightness, lifetime and whether the next lamp could be made equally well.
Edison was not the first person to produce electric light. Joseph Swan and others had incandescent work of their own; they were not a queue of inevitable failures awaiting the hero. Edison's team advanced the lamp and its surrounding electrical system together.
Lighting one bulb is not the same as supplying a street reliably. Generators, wiring, switches, meters, manufacturing and maintenance all have to work. A householder will not troubleshoot a brilliant idea every evening merely because its inventor deserves admiration.
Pearl Street station began supplying lower Manhattan in 1882. A laboratory success worth visiting was becoming something offices and homes expected to happen again tomorrow. After celebrating the first evening's light, somebody still had to make the second evening dependable.
A demonstration must succeed in front of spectators. A service must also succeed when nobody is applauding. Replacement parts, accounts and somebody to call when things break sound unromantic. They help determine whether an invention can remain in ordinary life.
The bulb was both an achievement and an entrance. Behind it lay unfinished work; ahead was someone who wanted to read after dinner. That person need not know the inventor. Once the switch is pressed, the hope is to stop thinking about the light.
III. From a Voice to a Business
The phonograph gives this ability another shape. In 1877 Edison's work made recording and replaying sound a striking reality. Someone could be absent and yet their voice return. That was an astonishing experience before it was a dependable business.
Novelty becomes routine only through further work: building machines, making recordings, discovering uses. An inventor sees a possibility; users arrive with other questions. Companies, factories and markets sometimes sustain it, sometimes carry it somewhere its originator had not intended.
Motion pictures also require more than one name. William Kennedy Laurie Dickson and the laboratory team carried out crucial development. The Kinetoscope let an individual look through a peephole; it was not the later cinema screen. Different devices and contributors cannot all become Edison.
The Black Maria studio, production and sales helped a business grow around the equipment. But the route from camera to audience kept branching. Viewing habits changed and competitors entered. Patents could protect an achievement and also become ways of obstructing others.
Edison's distinction is not that he invented everything alone, but that he repeatedly pushed work beyond demonstration. That effort itself depended on collaborators, investors, workers and customers. There was no single pair of hands carrying the whole undertaking into the market.
A thing that works without its inventor standing beside it is an achievement. Self-sustaining, however, does not mean fair or accessible to everyone. Who pays, who receives credit and who bears risk remain questions after the business opens.
IV. New Things Do Not Answer Everything
Beside Socrates, Edison seems to work at another tempo. One asks what your assertion means; the other puts a device on the table and invites you to try it. These are actions worth comparing, not two kinds of human being unable to communicate.
Making something requires undoing mistaken assumptions; asking a question often requires building a new account. Hume did not stop everyday causal judgment, and Quine did not abolish every distinction. Philosophers who only dismantle and inventors who never question are equally convenient inventions.
Electric light changed illumination without causing gas, kerosene and candles to vanish on one appointed day. Wires required money and time; places could afford different provisions. The replacement of one world by another was also a long history of coexistence.
Workers in older industries were not scenery that automatically shattered. A technological change meant retraining for somebody, a closing shop for somebody else, dependable evening light for another household. The same development could move people into very different positions.
I have something better therefore invites another question: better for whom, at whose expense? Lighting allows reading, but can also extend factory hours. New capabilities do not automatically decide how people will organise their relationships or distribute the additional work.
Edison need not be charged with every subsequent consequence. Neither can success stamp every consequence good. A device changes what can be done; what should happen next remains a human question. The light comes on, and the conversation continues.
V. People in the War of Currents
By the late 1880s, electrification involved competition over investment, companies and public confidence. Edison's direct-current interests faced alternating-current systems promoted by Westinghouse and others. Tesla's polyphase motors and related work were important contributions, not the origin of all alternating current.
Transformers made changing AC voltage comparatively straightforward, helping transmission over greater distances under contemporary conditions. DC was not inferior electricity or a natural phenomenon Edison created. Modern high-voltage DC has its uses. Compare systems in particular circumstances, not timeless moral teams.
Safety concerns were real: high-voltage lines killed people and cities needed regulation. Edison had judgments about danger as well as commercial interests. We need not invent a single private motive. The question is what happens when genuine fear becomes a label attached to a competitor.
Harold Brown's animal electrocution experiments and advocacy of electrical execution intersected with support from Edison interests. Edison also gave testimony concerning execution. Distinguishing their roles does not excuse him. It places criticism where evidence supports it, instead of assigning every cruelty to one man.
Showing a danger and using it to manufacture a commercially useful impression are different activities. If the demonstration has already arranged its only acceptable conclusion, safety becomes marketing. The lives used in the display cannot be entered only under publicity gained.
The disturbing part is not that an inventor failed to win forever. Someone skilled at making things work could still let reputation and investment crowd his judgment. A system's earlier success does not entitle it to dictate all future wiring.
VI. Perspiration Still Needs Judgment
The familiar language of one percent inspiration and ninety-nine percent perspiration can discourage waiting for a miracle. It should not suggest that thinking is unnecessary and an answer will emerge once somebody has tested every available substance.
Nobody can try everything. Choosing a material, deciding what to compare and distinguishing a faulty filament from a leaking bulb all require thought. Calculation, craft and records are not inspiration's enemies. They turn a guess into work that can be examined and revised.
A failed test recorded only as failure may simply be repeated. Conditions, changes and results allow somebody else to ask what could be different. Such accumulation is not a medal for suffering. It keeps the next person from beginning in the same darkness.
Nor do careful experiments insure commercial success. Edison invested substantial money and years of effort in ore milling, with disastrous business results. Someone who understood factories and markets could still back the wrong direction and keep going after heavy commitments.
Persistence is consequently a problem, not an all-purpose instruction. Stopping today may miss tomorrow's breakthrough; continuing may only postpone admitting yesterday's expenditure cannot be recovered. No fixed percentage tells us which situation we are in.
What deserves inheritance is perhaps not never give up, but the refusal to make either persistence or withdrawal unquestionable. Admit new evidence, let colleagues object, allow one abandoned project to mean less than a failed person. A method unable to revise itself becomes another lock.
VII. Two People, Not Two Half-People
After Tesla comes Edison, and a tidy pairing is tempting: truth against the market, imagination against execution. The arrangement makes the story easy to remember. It also makes both people thinner than the lives they actually led.
Tesla sought patents, investment and industrial partnerships. Edison needed imagination, calculations, inferences and changes of plan. A greater reliance on mental pictures or organised experimentation does not turn their abilities into incompatible organs. Both had to negotiate with materials and other people.
In 1917 Tesla received the Edison Medal from the American Institute of Electrical Engineers. The name may seem ironic, but the award was not a private reconciliation presided over by Edison. A profession is more than the extended personal relationship of two celebrities.
Nor must the men be combined into one complete person. Having limits and needing collaborators does not make somebody half a human being. Nobody has to be discoverer, engineer, manager and investor simultaneously before their work deserves a place in the world.
Markets provide resources and may favour the readily saleable. Rejection by a market, however, does not prove a design technically established. Tesla's global wireless-power ambitions still required engineering validation; Edison's business achievements did not certify every judgment he made.
The useful question may therefore be how different abilities can work together. Who can identify a problem, revise a goal, receive credit or continue after leaving? Arranging those possibilities is harder than casting two inventors as enemies for all eternity.
VIII. When the Sign Loses a Name
In 1892 Edison General Electric and Thomson-Houston merged to form General Electric. The name and control changed. The missing surname was a conspicuous alteration to the sign; the life beyond that sign did not stop on the day it changed.
Edison retained his laboratory and other ventures, alongside continuing research and patent relationships with the electrical business. A life does not end when a company changes its letterhead. Losing leadership in one direction can coexist with pursuing another.
That does not make lost control trivial. Work organised over many years may stop answering chiefly to its originator, bringing real conflicts and possible disappointment. But we cannot appoint a parable to decide everything a historical person felt.
One question remains worth keeping. If a service can finally continue through many people's work without the founder's daily approval, has it fulfilled part of the original hope? No longer being indispensable can be one result of having made something succeed.
Independence must not, however, become permission to erase contributors. Remembering collaborators, treating rights and pay fairly, and not discarding people as exhausted materials are compatible with allowing successors to revise an older plan. A working organisation still has obligations to people.
Edison received enormous honours and suffered failures. He need not become an abandoned tragic hero to belong in this series. Successful lives face the question too: when an undertaking becomes bigger than its founder, how can the founder remain a person rather than a sign?
IX. Some Lights Must Stay On
Edison died at Glenmont in New Jersey on 18 October 1931, aged eighty-four. One moving tribute involved darkness: briefly removing familiar light to notice how thoroughly it had become part of ordinary expectations.
President Hoover's statement is more particular than the legend. He proposed that individuals voluntarily switch off their lights for one minute at a specified time on 21 October. He explicitly opposed stopping generating plants because essential services could not safely be interrupted.
That qualification matters more than a picture of an entire nation blacked out. Some lights had to stay on. Electricity now supported other people's safety and health. Honouring an inventor could not require endangering people whose lives depended on the system.
Now bring Edison onto this series' imaginary bridge. He examines the base of a bulb. Tesla stands nearby; Quine closes a notebook; Beauvoir keeps her book within reach. They are not divided into winners and losers. They wait while he makes the connection.
Somebody passes a wire; somebody steadies the holder. Edison tightens a loose connection. This invented action gets closer to his legacy than a bulb magically illuminating in his hand: bringing light here takes more than one pair of hands.
The lamp lights Socrates' face, Hume's board and the person who helped from the shadows. Its bearer is not the only person in the picture. Nobody needs to be reduced to a famous ending before being allowed into the light.
They could darken this lamp for a while and hear the river. But if someone farther away still needs illumination, let those other lamps remain on. Other people's inconvenience need not establish the seriousness of our remembrance.
Edison moves his hand away from the switch. The lamp keeps burning. This time it is neither displaying nor commemorating him. Somebody still needs to cross.
Notes
[1] The crucial October 1879 filament experiments used carbonised cotton thread; commercial bamboo followed. Electric lighting and supply were collaborative, and the peephole Kinetoscope was not a cinema projector. Archival and National Park Service accounts inform the treatment of Dickson's contribution, the ore-milling business failure and continuing research relationships after the 1892 merger. The 1,093 figure counts US patents, not an unbeatable record.
[2] The current war requires distinctions among technical conditions, safety concerns, interests and participants; Topsy is not presented as an Edison-led campaign. The percentage maxim is discussed as a familiar saying, not evidence for a precise count of failed experiments. AIEE presented Tesla's medal in 1917. Hoover proposed voluntary individual darkening and rejected stopping power plants in 1931. The bridge's wiring scene is literary invention.