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Heatercathodeshort · 26th Apr 2019, 6:50 pm

Well this is how it started and these examples from my collection have probably survived more than 1000 hrs!

Pictures 1&2. Very early carbon filament top pip evacuation [1905?]

3. GEC. They must have borrowed the glass bulbs from the valve
dept..

4 A later drawn wire cage filament. [1930's?]

5 An early drawn wire cage filament. 'Royal Ediswan' [1930's?]

Lamps run on much reduced voltage to allow photography of filaments [40-50v]

Enjoy, John.

26th Apr 2019, 6:50 pm	#36
Heatercathodeshort Dekatron Join Date: Jun 2005 Location: Warnham, West Sussex. 10 miles south of DORKING. Posts: 9,147	Re: The lightbulb conspiracy Well this is how it started and these examples from my collection have probably survived more than 1000 hrs! Pictures 1&2. Very early carbon filament top pip evacuation [1905?] 3. GEC. They must have borrowed the glass bulbs from the valve dept.. 4 A later drawn wire cage filament. [1930's?] 5 An early drawn wire cage filament. 'Royal Ediswan' [1930's?] Lamps run on much reduced voltage to allow photography of filaments [40-50v] Enjoy, John. Attached Thumbnails