be attached, iron mold is di- since it has a vided, and the greater power hardened glass of heat resist- bulb is thrown ance than any out. Its shape other known is about like metal. But that of a young pi at in u m is leek or onion— very expensive. much enlarged Its cost is sel- —and with the dom… … After the Placing the threaded brass collars on the necks of the bulbs. all made by the bulbs have been same formula; unpacked 0 n ELECTEIC LAMPS IN THE MAKING. otherwise, when their arrival at heated, they the lamp fac- would not join together. Filaments of the type in gen- On account of their…
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