One of two carbons from Crompton and Pochin Arc lamp (10 amperes)
One of two carbons from Crompton and Pochin Arc lamp (10 amperes), 1892 patent
Crompton and Pochin Arc lamp (10 amperes), 1892 patent
One of two carbons from Crompton and Pochin Arc lamp (10 amperes), 1892 patent
One of two carbons from Crompton and Pochin Arc lamp (10 amperes), 1892 patent
Crompton and Pochin Arc lamp (10 amperes), 1892 patent