William Ramsay used them to isolate the noble gases, and Joseph Swan and Thomas Edison used them to evacuate their new carbon filament lamps.
22.
GE tungsten filament lamp embodying the invention of US Pat 1, 018, 502-- one of those involved in the 1926 US v GE litigation
23.
GE's patents on the tungsten filament lamp expired in the late 1930s and other forms of lighting were becoming more important than incandescent bulbs.
24.
The modern incandescent lightbulb, with a coiled filament of tungsten, was commercialized in the 1920s developed from the carbon filament lamp introduced in about 1880.
25.
For example, in 1935, the German Army developed a photophone where a tungsten filament lamp with an IR transmitting filter was used as a light source.
26.
A commonly used light in the home in the 1960s in 220 240 V countries was a circleline tube ballasted by an under-run regular mains filament lamp.
27.
Contrary to the existing carbon-filament lamps, Nernst lamp could operate in air and was twice more efficient as its emission spectrum was closer to that of daylight.
28.
This marked the first widespread use of floodlighting at a fair, and also the first use of high-pressure gas mantle lamps and of high-wattage tungsten filament lamps.
29.
The harsh and brilliant light was found most suitable for public areas, such as Cleveland's Public Square, being around 200 times more powerful than contemporary filament lamps.
30.
Chaillet was engaged by the Schaefer Company in Germany to assist in making filament lamps and remodeling their plant, eventually putting him in charge of the largest factory in Germany.
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