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James Pitkin demonstrating his Portable Electric Lamp

Légende

James Pitkin demonstrating his Portable Electric Lamp. For mines to the Royal Society in 1887. The demand for a new safety lamp in mines has directed many minds to the application of electricity to this purpose. Some have proposed to use primary batteries; others utilise secondary batteries or accumulators. One of the most portable, compact, and convenient forms is that of Mr. Pitkin.. The three-cell battery gives a light equal to 2.5 candles immediately after removal from the charging source, and lasts for nine or ten hours

Crédit

Photo12/Ann Ronan Picture Library

Notre référence

ARP23A17_467

Licence

Droits gérés

Format disponible

60,0Mo (2,0Mo) / 36,4cm x 41,3cm / 4303 x 4874 (300dpi)

Mots clés

James Pitkin demonstrating his Portable Electric Lamp. For mines to the Royal Society in 1887. The demand for a new safety lamp in mines has directed many minds to the application of electricity to this purpose. Some have proposed to use primary batteries others utilise secondary batteries or accumulators. One of the most portable, compact, and convenient forms is that of Mr. Pitkin.. The three-cell battery gives a light equal to 2.5 candles immediately after removal from the charging source, and lasts for nine or ten hours James Pitkin demonstrating his Portable Electric Lamp. For mines