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Date 1920 to 1929 Remove constraint Date: <span class='from'>1920</span> to <span class='to'>1929</span>

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    • 1922

    Printed photographic reproduction illustrating two wiring plans for a doorbell: one bell and two push buttons with either button ringing the bell, the other showing two bells and two push buttons with each button…

    • 1922

    Daily weather map of the United States with symbols indicating the state of weather as well as isobars and isotherms illustrated by continuous or dotted lines, respectively. Arrows denote wind direction.

    Illustration…

    • 1922

    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…

    • 1922

    Scientific diagram illustrates the percentage composition of foods including corn, potato, onion, apple, peanut butter and olive oil. Illustrations are after the charts created by Charles Ford Langworthy of the United…

    • 1922

    Scientific diagram illustrates the percentage composition of foods including a pork chop, cod, egg, cream cheese, bean and bread. Illustrations are after the charts created by Charles Ford Langworthy of the United…

    • 1922

    Junior high school or high school-aged male students gather around a teacher who is conducting a scientific experiment. Several students have their hands raised. Pennants on the wall list "Pioneer Science Club" and…

    • 1922

    Junior high school/high school-level textbook on science with topics including air; food; water; weather; fire; heating, lighting and electricity within homes; clothing and microscopic organisms. Begins with a foreword…

    • circa 1924

    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…

    • circa 1924

    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…

    • circa 1924

    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…

    • 1920s

    General view of an unidentified employee at work in the Dearborn Chemical Company's 35th Street Laboratory facility and manufacturing plant. A variety of titration equipment and other scientific apparatus are visible on…

    • 1920s

    General view of employee Al Herman analyzing an unidentified substance at the Dearborn Chemical Company's 35th Street laboratory facility and manufacturing plant. Assorted scientific apparatus and laboratory glassware…

    • 1920s

    General view of an unidentified employee analyzing an unidentified substance at the Dearborn Chemical Company's 35th Street laboratory facility and manufacturing plant. A microscope and water quality test kit are…

    • circa 1924

    General view of balances in use at the Dearborn Chemical Company's 35th Street Laboratory facility and manufacturing plant. The employee visible in the photograph are identified as Charles S. White (left) and C.C.…

    • circa 1924

    General view of a work bench in the factory control work area of the Dearborn Chemical Company's 35th Street Laboratory facility and manufacturing plant. The employee visible in the photograph is identified as W.…

    • circa 1924

    General view of an extraction rack in use at the Dearborn Chemical Company's 35th Street Laboratory facility and manufacturing plant. The employee visible in the photograph is identified as A. Sherwood. Per notations…

    • circa 1924

    General view of the Receiving Room at the Dearborn Chemical Company's 35th Street Laboratory facility and manufacturing plant. The employee visible in the photograph is identified as Genevieve Work. Per notations…

    • circa 1924

    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…

    • circa 1924

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

    • circa 1924

    General view of an unidentified employee at work in a store room at the Dearborn Chemical Company's 35th Street laboratory facility and manufacturing plant, with view of assorted barrels and other containers. Founded in…

    • circa 1924

    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…

    • circa 1924

    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…

    • circa 1924

    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…

    • circa 1924

    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…

    • circa 1924

    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…