General view of chemist Delores Horne analyzing the active constituent of a weed killer in the Dow Chemical Company's Analytical Laboratory located in Midland, Michigan. Per a notation accompanying the photograph, Ms.…

General view of employees at work in the main laboratory at the Dow Chemical Company facilities located in Midland, Michigan. Assorted laboratory glassware and apparatus are visible throughout the laboratory.

General view of an unidentified employee inspecting a saran bubble as it is extruded from a machine during the production of saran film at the Dow Chemical Company plant in Midland, Michigan. During production, the film…

Elevated view of employees at work in the Dow Chemical Company's saran film manufacturing facilities in Midland, Michigan. During production, saran film was trimmed and wound into so-called inventory rolls, such as…

General view of saran bubbles being extruded from rolling machines during the production of saran film at the Dow Chemical Company plant in Midland, Michigan. During production, the film passed through a series of…

General view of an unidentified employee at work in the Dow Chemical Company's saran film manufacturing facilities in Midland, Michigan. Saran plastic is seen passing through some type of bath or wash by virtue of a…

General view of two unidentified employees at work in the Dow Chemical Company's saran film manufacturing facilities in Midland, Michigan. The employees are seen stretching a length of film between two rollers. During…

General view of employees at work in the Dow Chemical Company's saran film manufacturing facilities in Midland, Michigan. Initially developed for the U.S. Army to wrap arms and equipment for transport during World War…

A spectrograph is an instrument used to obtain and record a light spectrum—it splits the light from an object into its component wavelengths so that it can be analysed. The spectral lines of a chemical element is…

Black finished cylindrical casing with three copper electrodes in a line next to product inscription; nickel knob is raised above the cylinder; outer dial goes from 0-15 (but only three digits are visible through its…

General view of laboratory technicians analyzing assorted materials in a Dow Chemical Company laboratory. Per notations accompanying the photograph, Bill Herrick (left) is analyzing calcium chloride, which was used for…

General view of technician Leo Ruhnau using an apparatus to determine the percentage of hydrochloric acid in Dowell acids at a Dow Chemical Company laboratory.

General view of technicians Marguerite Tenhunen (left) and Dorothy Ferris (right) using assorted apparatus in a Dow Chemical Company laboratory to determine the quantity of zinc present in experimental alloys.

Close-up view of the Charge and Press machine used to fill shells with an explosives charge the Hercules Powder Company plant in Port Ewen, New York. After the charge was pressed into the bottom of the shells, the…

General view of employee Jim Kennedy operating a press machine used to fill electric blasting caps with an explosive charge at the Hercules Powder Company plant in Port Ewen, New York. The operation was…

General view of the machine shop at the Hercules Powder Company plant in Port Ewen, New York, showing employees at work on a variety of machines, including planers, milling machines, and lathes. Formed in 1912 as part…

General view of employees Harold Struber (left) and Raymond Leahy operating a wire-cutting and stripping machine at the Hercules Powder Company plant in Port Ewen, New York. During the production of electric blasting…

General view of employee Joe Bechtold operating a capsule machine used to punch strips of copper into discs during the production of small shells at the Hercules Powder Company plant in Port Ewen, New York. Formed in…

General view of an unidentified employee operating a milling machine at the Hercules Powder Company plant in Port Ewen, New York. Formed in 1912 as part of an anti-trust settlement with DuPont, the Hercules Powder…

General view of mix house group leader Benny Williams mixing Pentaerythritol tetranitrate (PETN) with graphite for use in the electric blasting caps produced at the Hercules Powder Company plant in Port Ewen, New York.…

General view of Joseph Maurer pouring ethyl cellulose into the hopper of a plastic extrusion machine at the Hercules Powder Company plant in Port Ewen, New York. In the machine, the ethyl cellulose was heated and then…

Close-up view of a plastic extrusion machine used to coat and insulate wires at the Hercules Powder Company plant in Port Ewen, New York. As visible in the photograph, ethyl cellulose was heated and then extruded as…

Close-up view of an automatic press machine used to fill shells with an explosives charge the Hercules Powder Company plant in Port Ewen, New York. Formed in 1912 as part of an anti-trust settlement with DuPont, the…

General view of several employees at work on the automatic loading line for the production of detonators and initiators at the Hercules Powder Company plant in Port Ewen, New York. On the left-hand side of the…