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Show I ITraced ! Traced from Cave Man Man's Mans ' . TorchFor TorchFor Torch Torchfor for centurl centuries . . the only 0017 source 'Ource Ource ' of ofartl oartificial ofartificial artl artificial c1a1 Dht light , wa was . the open ftame flame ftameThI flameThis flameThis ThI This . can be traced from the cave caveman caveman's cav cavman's < man man's mans ' . . torch through history hI.tory hItory . up to tothe tothe t tthe < the time Urn tam . Edison EdI.on EdIon . Invented bis h1I his firsIncandescent ftnt first ftnti ftntwande.cent firstIncandescent i wande.cent wandecent Incandescent . lamp BkUson EdiJon Edison put theopen the theopen thiopen open flame ftame In a bottle and , gave ave wa us usa a & light Blht .ourc ourc . source . that was waa lat safe . to uae use useconvenient . , , convenient and variable In fn size .1ze 1ze . |