... Then, Isaac Post, a Quaker, had the intuition of using the alphabet, inviting the spirit to designate with knocks the letters ... the worlds were continuously improved. Table-tapping led to alphabetical dials, pencils attached to mobile boards, and so forth. read more...

Tom Beaver Oral History 3 of 9 December 10, 2017

... table, like this, and put our, um, just on 3x5 cards, the alphabet, and the digits, 0 through 9, spread them out, and turned a read more...

... a code that matched the number of raps to letters in the alphabet. Albeit timeconsuming, they were able to discern that the read more...

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