From Sell's National Directory of Large Commercial Houses and Buyers' Guide. London: Business Dictionaries Ltd., 1920.
Perhaps the first digital micrometer. Ciceri Smith was from Edinburgh, Scotland and in the wire mesh business, so he made a micrometer to make it easier for employees to gauge wire thickness. The device was apparently accurate to .0001 inches! He took out a U.S. Patent (No. 495,379) in 1893. Apparently, Brown & Sharpe bought the U.S. rights. Surviving examples of these devices change hands for big money nowadays.
For more information, and pics of the real thing, visit the Practical Machinist.