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    • circa 1890

    Brass cup-shaped receptacle used when crushing or grinding ingredients. Side of receptacle has two handles. Grooves along top and bottom circumference.

    • circa 1900

    Photograph depicting a group of male and female chemistry students at an unknown school or college. The students are posed holding assorted laboratory equipment and glassware. Some of the female students are also…

    • circa 1910

    Photograph depicting male and female chemistry students in a laboratory at an unidentified school or college. The students are grouped around several laboratory stations and are seen using test tubes and Bunsen burners…

    • Part of Instruments of Precision Laboratory Apparatus, M-L Catalog
    • 1911

    An "instrument intended for measuring spectra photographs, gratings, divided scales, or such objects which can be focused by the microscope and will allow rapid measurements of the highest possible accuracy." The design…

    • Part of Instruments of Precision Laboratory Apparatus, M-L Catalog
    • 1911

    "The collimators and observing telescopes have apertures of 50mm., and focus by rack and pinion. Two 60 degree prisms of heavy flint glass and of 70mm. side are furnished with the instrument. The mirror may be used in…

    • Part of Instruments of Precision Laboratory Apparatus, M-L Catalog
    • 1911

    Top figure is a Foucault heliostat, which reflects the rays of the sun in a horizontal direction. Bottom figure is a two-mirror heliostat, where the second mirror allows the path of the light beam to be thrown in any…

    • Part of Instruments of Precision Laboratory Apparatus, M-L Catalog
    • 1911

    "This spectroscope will show the first order of spectrum all at once across the field of the eyepiece."

    • Part of Instruments of Precision Laboratory Apparatus, M-L Catalog
    • 1911

    Top figure is a laboratory spectrometer with a polarizing attachment. Lower figure is a spectrometer with a third arm and camera attachment.

    • Part of Instruments of Precision Laboratory Apparatus, M-L Catalog
    • 1911

    "For studying the reflection, refraction, absorption and polarization of radiant heat."

    • Part of Instruments of Precision Laboratory Apparatus, M-L Catalog
    • 1911

    "The instrument is designed after suggestions from Prof. D. B. Brace, for whom a number of these instruments were built."

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

    No. 1639. Parabolic Reflectors, used to collect sound, light or radio waves.
    No. 1641. Melloni's Apparatus, for demonstrating the phenomena of absorption, polarization, reflection and refraction of radiant heat.

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

    Steam and gas engines.

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

    "This apparatus was designed to supply our own laboratory with an electro-magnet of sufficient strength and field concentration for magnetizing, experimentation, etc. With its accessories listed below it becomes…

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

    Quadrant electrometer and electrometer for radioactive measurements.

    • 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

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

    • 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

    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

    Apparatus for showing Tesla's experiments with electricity.

    • 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

    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

    "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

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

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

    Wave apparatuses for the study of transverse and longitudinal waves.