Front matter
Reading edition
One of two Ruhmkorff Coils made by Queen & Co. The output with about 650 Watts of current in the primary was a torrent of sparks 45 inches in length.
Reading edition
One of two Ruhmkorff Coils made by Queen & Co. The output with about 650 Watts of current in the primary was a torrent of sparks 45 inches in length.