General view of an unidentified employee at work in the Dearborn Chemical Company's 35th Street laboratory facility and manufacturing plant. Founded in 1887, the Dearborn Chemical Company was a corporate ancestor of…

General view of an unidentified employee at work in the Dearborn Chemical Company's 35th Street laboratory facility and manufacturing plant. Founded in 1887, the Dearborn Chemical Company was a corporate ancestor of…

General view of an unidentified employee at work in the Dearborn Chemical Company's 35th Street laboratory facility and manufacturing plant. Founded in 1887, the Dearborn Chemical Company was a corporate ancestor of…

General view of several unidentified employees at work in the Dearborn Chemical Company's 35th Street laboratory facility and manufacturing plant. Founded in 1887, the Dearborn Chemical Company was a corporate ancestor…

General view of two unidentified employees at work in the Dearborn Chemical Company's 35th Street laboratory facility and manufacturing plant. Founded in 1887, the Dearborn Chemical Company was a corporate ancestor of…

General view of the exterior of the Dearborn Chemical Company's 35th Street laboratory facility and manufacturing plant, with view of several large storage tanks. Founded in 1887, the Dearborn Chemical Company was a…

General view of the exterior of the Dearborn Chemical Company's 35th Street laboratory facility and manufacturing plant, with view of several large storage tanks. Founded in 1887, the Dearborn Chemical Company was a…

General view of employees Charles S. White (left) and C.C. Dennis (right) using balances at the Dearborn Chemical Company's 35th Street Laboratory facility and manufacturing plant. Founded in 1887, the Dearborn Chemical…

General view of employee C.C. Dennis using a mortar and pestle to crush specimens for use at the Dearborn Chemical Company's 35th Street laboratory and manufacturing facility located in Chicago, Illinois. Founded in…

General view of several unidentified employees at work in the barrel storage area at the Dearborn Chemical Company's 35th Street laboratory facility and manufacturing plant. Founded in 1887, the Dearborn Chemical…

General view of several unidentified employees filling barrels at the Dearborn Chemical Company's 35th Street laboratory facility and manufacturing plant. Founded in 1887, the Dearborn Chemical Company was a corporate…

General view of employee Anton H.R. Noreen preparing samples for testing at the Dearborn Chemical Company's 35th Street laboratory and manufacturing facility located in Chicago, Illinois. Founded in 1887, the Dearborn…

General view of employee Anton H.R. Noreen conducting an analysis of coal samples at the Dearborn Chemical Company's 35th Street laboratory and manufacturing facility located in Chicago, Illinois. Founded in 1887, the…

General view of employee A. Sherwood using an extraction rack at the Dearborn Chemical Company's 35th Street Laboratory facility and manufacturing plant. Per notations accompanying the photograph, the extraction rack is…

Map illustrating the Wachusett, Sudbury and Cochituate watersheds with the reservoirs, aqueducts and pipe pines that supply water to Boston, Massachusetts. Caption reads "This is one of the greatest water systems of the…

Technical publication pamphlet providing information regarding the Wallace & Tiernan Co., Inc. manual control chlorinator apparatus. Discusses the sterilization of water by chlorination and the advantages of using…

Technical publication pamphlet providing a cost analysis of liquid chlorine and hypochlorite products. Discusses the increase in chlorine chemical costs, and the price of water purification apparatus. Underscores the…

Primarily intended for a non-technical operator of small plants, and particularly of one where chemicals are used, Water Purification Plants and Their Operation provides a concise overview of the operation of…

From Water Purification Plants and Their Operation, a volume primarily intended for non-technical operators of small water purification plants, and particularly of one where chemicals are used. Provides a concise…

A photographic print of a liquid chlorine apparatus used for water sterilization, courtesy of the Electro-Bleaching Gas Company.

From Water Purification Plants and Their Operation, a volume primarily intended for…

Schematic showing an aerial view of a mechanical water filtering plant with cutouts to depict the interior workings of the plant.

From Water Purification Plants and Their Operation, a volume primarily intended for…

An aerial illustration of a slow sand water filtering plant with cutouts to depict underground activity.

From Water Purification Plants and Their Operation, a volume primarily intended for non-technical operators of…

Figure depicting a map of the United States and the geographic patterns of water properties affected by geologic formations. Depicts areas of primary and secondary formations, limestone, glacial drift, and pollution by…

Pamphlet summarizing data accumulated by the Stamford Water Works reflecting the bacterial and mechanical efficiency of an automatic control for liquid-chlorine disinfection of water. Includes data tables and two black…

Cover and illustrated color plates from the 3rd edition of The microscopy of drinking water by George Chandler Whipple. Per the author, the book is designed to serve as a guide for the water analyst and water-works…