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Electric battery-powered Swan safety lamps, British, early 20th century

Electric battery-powered Swan safety lamps, British, early 20th century
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Largest available format 3504 × 2837 px 1 MB
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Large 3504 × 2837 px 297 × 240 mm 1.4 MB
Medium 1024 × 829 px 87 × 70 mm 1.0 MB

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IMAGE number
UIS5062579
Image title
Electric battery-powered Swan safety lamps, British, early 20th century
Auto-translated text View Original Source
Artist
Unknown
Location
Science Museum, London, UK
Medium
object
Image description

Electric battery-powered Swan safety lamps, British, early 20th century. Two early safety lamps. The carbon filament Swan lamp was introduced in 1878 and electric lamps were used for stationary purposes underground in Glasgow and Nottingham as early as 1881. The lamp shown on the left has a rheostat, which reduced the current consumption when only a dim light was required. Both have on-off switches and springs to keep the filament loops in contact. The space between outer casing and lamp bulb was made airtight, but with sufficient air to consume the filament if the bulb should break. ©SSPL/Science Museum

Photo credit
SSPL/UIG / Bridgeman Images
Image keywords
20th century / lighting / light bulb / electricity / lamp / thing / Science / Underground / break / Pausa

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