Sub-series contains records generally referred to by the Essex Company as Gauge Books, ranging in date from 1845-1979. Included in this sub-series are mostly small field books that were used to record water gauge readings of the Essex Company at the various mill sites along the North and South canals between 1845 -1947. Also present are books that document gauge readings at the North Pond, the Lower Locks, the Merrimack River, and the water levels on the flashboards. There are also a few bound volumes that show gauge readings and water heights at various locations upriver in the Merrimack River watershed, and some locations in Maine at which the Essex Company engineers were engaged in work.
Collection
Essex Company Collection
Materials are typically 5"x7" field books, with a few larger volumes included.