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    • Condensers
    • Part of Marpmann's Illustrirte Fachlexika [Illustrated Encylopedia]
    • 1902

    Figures 1732 and 1733 depict Storch condensers, and figure 1734 shows a Walther condenser.

    • Spectroscope
    • Part of Marpmann's Illustrirte Fachlexika [Illustrated Encylopedia]
    • 1902

    Made by Hans Heele, Berlin, Germany.

    • Distillation and Reflux Condenser
    • Part of Marpmann's Illustrirte Fachlexika [Illustrated Encylopedia]
    • 1902

    Patented by A. Landsiedl.

    • Part of Marpmann's Illustrirte Fachlexika [Illustrated Encylopedia]
    • 1902

    Developed by Johan Kjeldahl in 1883, the method is used for the determination of nitrogen and carbon in organic compounds from the oxidation of substances like sulfuric acid. The apparatus shown in figure 1606 is…

    • Air Pumps
    • Part of Marpmann's Illustrirte Fachlexika [Illustrated Encylopedia]
    • 1902

    Figures 1858 and 1859 depict pumps where the tap control is either operated by hand or is a self-acting control. The two-stage pump in figure 1860 is outfitted with Babinet's cock, and is suitable for faster working.

    • Air Pumps
    • Part of Marpmann's Illustrirte Fachlexika [Illustrated Encylopedia]
    • 1902

    Piston air pumps according to Gay-Lussac.

    • Part of Marpmann's Illustrirte Fachlexika [Illustrated Encylopedia]
    • 1902

    Apparatus according to Hodek for the rapid determination of the lime content of juices in sugar factories.

    • Part of Marpmann's Illustrirte Fachlexika [Illustrated Encylopedia]
    • 1902

    Device for the determination of sulfur dioxide in sulfuric acid gas from Alois Kreidl in Prague.

    • Part of Marpmann's Illustrirte Fachlexika [Illustrated Encylopedia]
    • 1902

    Apparatus for the continuous testing of feedwater for sugar content with alpha-naphthol.

    • Part of Marpmann's Illustrirte Fachlexika [Illustrated Encylopedia]
    • 1902

    Saturation apparatus.

    • Apparatus for Molecular Weight Determination
    • Part of Marpmann's Illustrirte Fachlexika [Illustrated Encylopedia]
    • 1902

    Figures 1966 and 1967 depict apparatuses for determining boiling point, according to Beckmann. Figure 1968 shows an apparatus for determining the freezing point with an electromagnetic resting device.

    • Apparatus for Molecular Weight Determination
    • Part of Marpmann's Illustrirte Fachlexika [Illustrated Encylopedia]
    • 1902

    Figure 1969 depicts an apparatus for determining boiling point, and figure 1970 shows an apparatus for determining molecular weight according to Beckmann, with tripod and movement device according to Gilson.

    • Part of Marpmann's Illustrirte Fachlexika [Illustrated Encylopedia]
    • 1902

    Apparatus for the determination of free humic acid in a bog.

    • Part of Marpmann's Illustrirte Fachlexika [Illustrated Encylopedia]
    • 1902
    • Retorts
    • Part of Marpmann's Illustrirte Fachlexika [Illustrated Encylopedia]
    • 1902

    Glass and copper retorts. The one depicted in figure 2245 is made of heavy glass for brown coal distillation.

    • Furnaces
    • Part of Marpmann's Illustrirte Fachlexika [Illustrated Encylopedia]
    • 1902
    • Vacuum Apparatus
    • Part of Marpmann's Illustrirte Fachlexika [Illustrated Encylopedia]
    • 1902

    With porcelain bowls of 1-2 and 5-6 liter capacities and water air pump with check valve.

    • Configurations Models; Sandbaths
    • Part of Marpmann's Illustrirte Fachlexika [Illustrated Encylopedia]
    • 1902

    Figures 2281 and 2282 depict models for chemical configuration, and figures 2283 and 2284 illustrate sandbaths.

    • Vacuum Apparatus
    • Part of Marpmann's Illustrirte Fachlexika [Illustrated Encylopedia]
    • 1902

    With metal boiler and distillation unit.

    • Vacuum Drying Apparatus
    • Part of Marpmann's Illustrirte Fachlexika [Illustrated Encylopedia]
    • 1902

    Figure 2560 depicts a vacuum drying apparatus for explosive substances, and figure 2561 show a vacuum drying oven made of wrought iron with lead sealing rings.

    • 1867

    The illustration on this page is believed to be the earliest depiction of the chemical structure of a benzene ring.

    This German work by August Kekulé (1829-1896) outlines his discoveries on the structure of benzene.…

    • 1867

    Including what is believed to be the earliest depiction of the chemical structure of a benzene ring, this German work by August Kekulé (1829-1896) outlines his discoveries on the structure of benzene. An early founder…

    • 1864-Oct-31

    Contains advice to his nephew on requesting recommendations. Text specifically mentions Friedrich Wohler and August Kekule.

    • 1858

    Early examples of paper chromatography from German chemist Friedlieb Ferdinand Runge, who is considered to be the originator of the analytic technique. Runge investigated the color reactions of various chemical…