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    • Part of Preis-Verzeichnis über Apparate und Gerätschaften für alle Laboratoriums-Arbeiten im Gebiet der Biochemie [Price-List on Apparatuses and Equipment for All Laboratory Work in the Fields of Biochemistry]
    • 1913

    Polarimeters are used to measure the angle of rotation of a beam of light passing through an optically active substance.

    • Part of Preis-Verzeichnis über Apparate und Gerätschaften für alle Laboratoriums-Arbeiten im Gebiet der Biochemie [Price-List on Apparatuses and Equipment for All Laboratory Work in the Fields of Biochemistry]
    • 1913

    B 2282. Electrometer for radioactive measurements.
    B 2285. Fontactoscope, an electroscope for measuring the radioactivity of water and gases.
    B 2300. Electrometer with internal amber insulation.

    • Part of Preis-Verzeichnis über Apparate und Gerätschaften für alle Laboratoriums-Arbeiten im Gebiet der Biochemie [Price-List on Apparatuses and Equipment for All Laboratory Work in the Fields of Biochemistry]
    • 1913

    B 2106. Precision apparatus for determining freezing point depression.
    B 2107. For determining freezing point depression for clinical purposes.
    B 2108. For determining freezing point depression for very small…

    • Part of Preis-Verzeichnis über Apparate und Gerätschaften für alle Laboratoriums-Arbeiten im Gebiet der Biochemie [Price-List on Apparatuses and Equipment for All Laboratory Work in the Fields of Biochemistry]
    • 1913

    B 185. Combination water distillation unit with drying cabinet and sand bath for gas heating.

    Also pictured are evaporating flask and dishes made of glass and metal.

    • Part of Preis-Verzeichnis über Apparate und Gerätschaften für alle Laboratoriums-Arbeiten im Gebiet der Biochemie [Price-List on Apparatuses and Equipment for All Laboratory Work in the Fields of Biochemistry]
    • 1913

    Portable universal respiration apparatus, according to specifications from Professor Francis Gano Benedict.

    • Part of Preis-Verzeichnis über Apparate und Gerätschaften für alle Laboratoriums-Arbeiten im Gebiet der Biochemie [Price-List on Apparatuses and Equipment for All Laboratory Work in the Fields of Biochemistry]
    • 1913

    B 181. Automatic, for gas heating, coal or wood firing.
    B 183. Fully automatic, with copper interior and steam heating.

    • Part of Catalog K: Physical Apparatus for Universities and Colleges
    • 1912-May

    Instrument that measures the wavelengths of light through a chemical sample. Can be used to determine elements in a sample when different elements emit different wavelengths of light. Illustrated instrument made by…

    • Part of Catalog K: Physical Apparatus for Universities and Colleges
    • 1912-May

    Spectroscopes use a lens or prism to disperse light into wavelengths. The spectroscopes shown can be handheld (top image) or attached to a camera (bottom image) to record the observation.

    • Part of Catalog K: Physical Apparatus for Universities and Colleges
    • 1912-May

    Instruments designed for photometric analysis. Photometers can be used to measure the presence and concentration of organic and inorganic compounds in solution by determining the absorbance of specific wavelengths of…

    • Part of Catalog K: Physical Apparatus for Universities and Colleges
    • 1912-May

    Wave apparatuses for the study of transverse and longitudinal waves.

    • Part of Catalog K: Physical Apparatus for Universities and Colleges
    • 1912-May

    Instruments for measuring both voltage and amperes of direct electric current.

    • Part of Catalog K: Physical Apparatus for Universities and Colleges
    • 1912-May

    "Parsons' latest improved design, for controlling incandescent lighting circuits, and for demonstrating the laws of series and parallel combinations."

    • Part of Catalog K: Physical Apparatus for Universities and Colleges
    • 1912-May

    From page 97: "These cells show the extraordinary property which selenium possesses of changing its electrical resistance under the influence of light."

    • Part of Catalog K: Physical Apparatus for Universities and Colleges
    • 1912-May

    Apparatus for showing the principles of an induction or alternating current motor; demonstrating the rotating magnetic field.

    • Part of Catalog K: Physical Apparatus for Universities and Colleges
    • 1912-May

    Apparatus for showing Tesla's experiments with electricity.

    • Part of Catalog K: Physical Apparatus for Universities and Colleges
    • 1912-May

    Various vacuum tubes for cathode ray demonstrations, including Crookes' Tubes, Holtz' Tube, and Lenard's Tube.

    • Part of Catalog K: Physical Apparatus for Universities and Colleges
    • 1912-May

    Various Geissler tubes for demonstration purposes. Invented by the glassblower, Johann Heinrich Wilhelm Geissler (1815-1878), a light is produced when an electric current is passed through the rarefied gas filled tubes.

    • Part of Catalog K: Physical Apparatus for Universities and Colleges
    • 1912-May

    No. 2213 is a Dynamo Analysis Apparatus, an electrical generator.

    • Part of Catalog K: Physical Apparatus for Universities and Colleges
    • 1912-May

    Static electricity generator used for experiments and powering X-ray machines.

    • Part of Catalog K: Physical Apparatus for Universities and Colleges
    • 1912-May

    Quadrant electrometer and electrometer for radioactive measurements.