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Antique Corner

Imperial brand Double hairpin lamp. First introduced in 1905, these used "GEM" filaments which were metalised carbon that had a lower resistance than normal carbon, and burned brighter. Since the resistance was lower, they needed to have a longer length of filament inside to run from the mains voltage so the Double Hairpin design was adopted- essentially 2 identical filaments connected in series.

Early breadboard mounted lamp sockets & "unmounted" form of knife-switch with Gutta-Percha insulated handle. 

 

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