Engraving depicting Joseph Swans combined battery-powered safety lamp and fire-damp indicator which gave just over 1 candle power for 10 hours. The fire-damp indicator at the bottom was made of fine platinum wire and when fire-damp was present it glowed abnormally bright. Sir Joseph Wilson Swan (1828-1914) an English physicist; chemist and inventor. Dated 19th century.

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Creative#:

TOP29619172

Source:

達志影像

Authorization Type:

RM

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須由TPG 完整授權

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