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…

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…

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…

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…

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…

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…

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…

Volume is a survey of studies for the improvement of steam power plant efficiencies from the perspective of applied chemistry. Describes the analyses and tests necessary for various materials used in the powerhouse.…

Print advertisement for ethylene dibromide manufactured and sold by the Dow Chemical Company for use in Ethyl gasoline. The advertisement features a seascape and an illustration of a mermaid, with accompanying text…

Color print advertisement for a variety of activated carbons manufactured and and sold under the trade name "Cliffchar" by the Cliffs Dow Chemical Company, a subsidiary of the Dow Chemical Company located in Marquette,…

Telegram from Henrietta Nesbitt (1874-1963), White House cook and housekeeper, to W.H. and L.D. Betz asking for an additional twenty gallons of the specially fabricated London city water to be delivered to the White…

Letter from First Lady Eleanor Roosevelt to Edwin M. Ross in which Roosevelt accepts Ross's offer to analyze and duplicate London city water which would be used to serve tea to the King and Queen of England.

Letter from Malvina C. Thompson (secretary to First Lady Eleanor Roosevelt) to Edwin M. Ross instructing him that the samples of water fabricated by Betz Laboratories to duplicate London City water has arrived. Mrs.…

Thank-you letter from First Lady Eleanor Roosevelt to Betz Laboratories for fabricating water identical to that found in London, which was then delivered to the White House and used for the tea served to the King and…

Color print advertisement for a variety of activated carbons manufactured and and sold under the trade name "Cliffchar" by the Cliffs Dow Chemical Company, a subsidiary of the Dow Chemical Company located in Marquette,…

Color print advertisement for Dowmetal, a magnesium alloy manufactured and sold by the Dow Chemical Company. The advertisement features waves moving across the sea, with accompanying text commemorating Dow's production…

Color print advertisement for magnesium alloys manufactured and sold by the Dow Chemical Company. The advertisement depicts a group of pirates digging for buried treasure, with accompanying text summarizing Dow's…

Print advertisement for Dowmetal, a magnesium alloy manufactured and sold by the Dow Chemical Company. The advertisement features an illustrated depiction of seawater, with accompanying text detailing the history of Dow…

Color print advertisement for magnesium alloys manufactured and sold by the Dow Chemical Company. The advertisement features an illustrated depiction of two ships floating on a cube of seawater with a view of the sea…

Color print advertisement for magnesium alloys manufactured and sold by the Dow Chemical Company. The advertisement features an illustrated depiction of a hand lifting a winged ingot of magnesium from the sea while…

Color print advertisement for Dowell Incorporated, a subsidiary of the Dow Chemical Company. The advertisement features an aerial view of an industrial power plant, with accompanying text detailing the use of Dowell…

Color print advertisement for magnesium alloys manufactured and sold by the Dow Chemical Company. The advertisement features an illustrated depiction of a hand lifting a winged ingot of magnesium from the sea, as well…

Color print advertisement for magnesium alloys manufactured and sold by the Dow Chemical Company. The advertisement features an illustrated depiction of a hand lifting a winged ingot of magnesium from the sea while…

Color print advertisement for the Texas Division of the Dow Chemical Company. The advertisement features an outline of the state of Texas with a cube of seawater rising from the center. The accompanying text details the…