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Creator Rittase, William M., 1894-1968 Remove constraint Creator: Rittase, William M., 1894-1968

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    • 1948-Feb

    General view of several rows of Plexiglas panels positioned on racks. Per notations accompanying the photograph, the panels are set up for an outdoor exposure test designed to demonstrate the weathering capabilities of…

    • 1951

    Close-up view of laboratory operator Donald Stevens using a press to remove water from a sheet of so-called "chemical cotton," i.e. purified cellulose obtained from raw cotton linters, manufactured in the Cellulose…

    • 1951

    General view of a roll rewinder in use in the Cellulose Department at the Hercules Powder Company plant in Hopewell, Virginia. Per notations accompanying the photograph, the roll rewinder was used to produce smaller…

    • 1951

    Close-up view of laboratory operator Percy L. Bell checking the composition of viscose solutions produced in the Cellulose Department at the Hercules Powder Company plant located in Hopewell, Virginia. The viscose…

    • 1951

    General view of laboratory operator Donald R. Stevens checking the filtration characteristics of viscose solutions produced in the Cellulose Department at the Hercules Powder Company plant located in Hopewell, Virginia.…

    • 1951

    General view of the production of carboxymethyl cellulose (CMC) at the Hercules Powder Company plant in Hopewell, Virginia. Also known as cellulose gum or tylose powder, CMC is a cellulose derivative commonly used as a…

    • 1951

    Close-up view of a Fourdrinier machine in use at the Hercules Powder Company plant in Hopewell, Virginia. Per notations accompanying the photograph, this Fourdrinier machine was used to dewater sheets of so-called…

    • 1951

    General view of an automatic banding machine in use in the Cellulose Department at the Hercules Powder Company plant in Hopewell, Virginia. The employees visible in the photograph are identified as Leroy Brown and John…

    • 1951

    General view of bales of cotton linters (short fiber residues left on the cottonseed after the longer staple, aka the "lint" fibers, are removed by ginning) in storage at the Hercules Powder Company plant in Hopewell,…

    • 1951

    Two views of employee Paul F. Brown feeding raw cotton linters (short fiber residues left on the cottonseed after the longer staple, aka the "lint" fibers, are removed by ginning) into a bale breaking machine in the…

    • 1940s

    Close-up view of several stacks of so-called "chemical cotton" manufactured at the Hercules Powder Company plant in Hopewell, Virginia. Chemical cotton, a type of purified cellulose obtained from raw cotton linters, is…

    • 1940s

    Close-up view of a stock of ethyl cellulose manufactured at the Hercules Powder Company plant in Hopewell, Virginia. Ethyl cellulose manufactured by Hercules was commonly purchased by a variety of public and private…

    • 1940s

    General view of an unidentified employee examining a control panel used in the production of ethyl cellulose at the Hercules Powder Company plant in Hopewell, Virginia. Ethyl cellulose manufactured by the Hercules…

    • 1940-Jun-17

    General view of a washing tub in use at the Hercules Powder Company's Ethyl Cellulose plant in Hopewell, Virginia. Per notations accompanying the photograph, constant agitation and continual charges of water were used…

    • 1940s

    General view of weigh-tanks for caustic soda and ethyl cellulose at the Hercules Powder Company's Ethyl Cellulose plant in Hopewell, Virginia. Per notations accompanying the photograph, caustic soda and ethyl cellulose…

    • 1940-Jun-17

    Close-up view of several rolls of sheeted cotton linters mounted on spindles at the Hercules Powder Company's Ethyl Cellulose plant in Hopewell, Virginia. Per notations accompanying the photograph, the cotton was…

    • 1949-Jan

    General view of an insulated test chamber used in the Plastics Laboratory at the Hercules Powder Company plant in Parlin, New Jersey to determine the impact resistance of plastics at sub-normal temperatures. Per…

    • 1949-Jan

    General view of employee Felix Nakielny removing a toilet seat cover from the dimension stability test cabinet used in the Plastics Laboratory at the Hercules Powder Company plant in Parlin, New Jersey. Per notations…

    • 1949-Jan

    Close-up view of operator Felix Nakielny removing a test piece from an injection mold apparatus used in the Plastics Laboratory at the Hercules Powder Company plant in Parlin, New Jersey. Per notations accompanying the…

    • 1949-Jan

    Close-up view of an extruder in use in the Plastics Laboratory at the Hercules Powder Company plant in Parlin, New Jersey. Extruders were commonly used to process and shape a variety of raw materials produced at the…

    • 1949-Jan

    Close-up view of V.F. Kurowsky operating a flow measuring device used to identify and control the ratio of base material to plasticizer in cellulose molding compounds produced in the Plastics Laboratory at the Hercules…

    • 1949-Jan

    General view of operator J.P. Deran removing injection molded cellulose materials from a 4-ounce Reed Prentice molding apparatus at the Hercules Powder Company plant in Parlin, New Jersey. Per notations accompanying the…

    • 1949-Jan

    Close-up view of the take-off jig used to control extruded shapes on a National Rubber 2-inch extruder in the Plastics Laboratory at the Hercules Powder Company plant in Parlin, New Jersey. The employee visible in the…

    • 1949-Jan

    Close-up view of a tumbling shaker used in the Plastics Laboratory at the Hercules Powder Company plant in Parlin, New Jersey to dissolve plastic materials in solvents. Per notations accompanying the photograph, the…

    • 1949-Jan

    Close-up view of V.F. Kurowsky operating a flow measuring device used to identify and control the ratio of base material to plasticizer in cellulose molding compounds produced in the Plastics Laboratory at the Hercules…