Slocomb started making center drills, micrometers and other machinist tools in 1891 John Tibbets Slocomb located his company in Providence R.I. and ran it till 1914 when he sold it to J.H. Drury of Union Twist Drill. After the second World War the company struggled and it was sold in 1953 to E. John Gregory, the owner of Green Machine Company, who moved the factory to Glastonbury, Connecticut. The company went under in the late 1990's.
Slocomb's claim to fame was the "I-Beam" micrometer frame. If you look at that micrometer in cross-section it's an I-beam. The claim was the I-beam design was more dimensionally stable, but maybe it was just a marketing gimmick. They feel good in the hand though.
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