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"If an excited substance be brought near a ball made of pith, or cork, suspended by a silk thread, the ball will, in the first place, approach the electric, as at a, indicating an attraction towards it, and if the position of the electric will allow, the ball will come into contact with the electric, and adhere to it for a short time, and whill then recede from it, showing that it is repelled, as at b." -Comstock 1850

Electrical Attraction

"If an excited substance be brought near a ball made of pith, or cork, suspended by a silk thread, the…

"The electromagnet that supplies the flux of force must have a current to excite it. This current is sometimes supplied from an outside source. Such a dynamo is said to be seperately excited." — Avery, 1895

Seperately excited dynamo

"The electromagnet that supplies the flux of force must have a current to excite it. This current is…