LINK: John E. Karlin, Designer of the 20th Century Telephone, Dies at 94
 

John E. Karlin, Designer of the 20th Century Telephone, Dies at 94 He also introduced the white dot inside each finger hole that later became a fixture of rotary phones. After the phone was redesigned at midcentury, with the letters and numbers moved outside the finger holes, users, to AT&T?s bewilderment, could ** longer dial as quickly… With blank space at the center of the holes, Mr. Karlin found, callers ** longer had a target at which to aim their fingers. The dot restored the speed.. (via df)

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