The Glastenbury Knitting Company (which, like the town where it was founded, later changed the spelling of its name to “Glastonbury“) was founded in 1855 by Addison L. Clark. The company produced men’s wool underwear (long johns, called “union suits” during the Civil War), reaching its peak during World War I when it produced 400,000 pairs for the U.S. army. Having acquired the Eagle Manufacturing Company woolen mills in Glastonbury 1855, the company built its first mill (c. 1860), just upstream on Salmon Brook, at the outlet to a small mill pond called Addison Pond. A fire in 1892 destroyed part of the mill, but Clark soon rebuilt and in 1897, a year after his death, the surrounding mill village of Eagleville was renamed Addison in his honor. The mill itself was expanded over the years, until about 1910. The company went out of business in 1936, during the Great Depression. The old mill was later used as a warehouse, but in 2005 it was acquired by developers who have converted it into upscale apartments under the name Addison Mill Apartments. The developers recreated a tower, destroyed by fire in the late 1930s, that had stood at the building’s western end. The new tower serves as a stairwell.
Nearby, at 38 Addison Street, is a warehouse, built c. 1900, where the company kept finished goods prior to shipment.