Electric Deck (also know as Magnetic Pack and Electric Pack) is a type of Mechanical Deck where the cards are strung together with thread which allows for flourishes of springing and the waterfalls to be easily performed. Many comedy magicians will expose the deck after performing what appears to be sophisticated slight of hand.
Robert-Houdin described a version in 1868 by gluing the cards end-to-end which allowed for the springing.
It was a known to be a pet effect of Carl Hertz around 1896.
It was being advertised by dealers as the "Electric Pack" as early as 1905 in magazines like the Magician Monthly.