Search Results
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CENCO Meters
- 1912
Catalog entries for voltameters, instruments for measuring both voltage and amperes of direct electric current.
Part of Catalog K: Physical Apparatus for Universities and Colleges, a catalog of laboratory instruments…
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Various Vacuum Tubes
- 1912
Catalog entry for 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, a catalog of…
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Melloni's Apparatus and Parabolic Reflectors
- 1912
Catalog entries for Parabolic Reflectors, used to collect sound, light or radio waves,
and Melloni's Apparatus, for demonstrating the phenomena of absorption, polarization, reflection, and refraction of radiant heat.
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Various Geissler Tubes
- 1912
Catalog entry for 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…
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Spectroscopes
- 1912
Catalog entry for two spectroscopes. 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…
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Precision Photometers
- 1912
Catalog entry for 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…
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Heavy Current Static Machines
- 1912
Catalog entry for a heavy current static machine.
Part of Catalog K: Physical Apparatus for Universities and Colleges, a catalog of laboratory instruments for the physical sciences made by the Central Scientific…
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Universal Physical Laboratory Supports
- 1912
Illustration of possible combinations of laboratory equipment on the "Universal Physical Laboratory Supports."
Part of Catalog K: Physical Apparatus for Universities and Colleges, a catalog of laboratory instruments…
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Lamp Rheostat
- 1912
Catalog entry for "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…
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Electrometers
- 1912
Catalog entries for a quadrant electrometer and an electrometer for radioactive measurements.
Part of Catalog K: Physical Apparatus for Universities and Colleges, a catalog of laboratory instruments for the physical…
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Electro Magnet with Copper Tube Attachment
- 1912
Catalog entry for an Electro Magnet apparatus. "This apparatus was designed to supply our own laboratory with an electro-magnet of sufficient strength and field concentration for magnetizing, experimentation, etc. With…
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Current Electricty: Standard Cells and Dynamo Analysis Apparatus
- 1912
Catalog entries for standard battery cells and a Dynamo Analysis Apparatus, an early example of an electrical generator.
Part of Catalog K: Physical Apparatus for Universities and Colleges, a catalog of laboratory…
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College Spectrometer (Wilson No. 2)
- 1912
Catalog entry for an 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. The…
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Apparatus for Showing Tesla's Experiments
- 1912
Apparatus for showing Tesla's experiments with electricity.
Part of Catalog K: Physical Apparatus for Universities and Colleges, a catalog of laboratory instruments for the physical sciences made by the Central…
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Apparatus for Lecture Table Demontration with Selenium Cells
- 1912
"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, a catalog…
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Alternating Current Demonstration Apparatus
- 1912
Apparatus for showing the principles of an induction or alternating current motor and demonstrating the rotating magnetic field.
Part of Catalog K: Physical Apparatus for Universities and Colleges, a catalog of…
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"The Geryk" Mechanical Air Pump for High Vacua
- 1912
Figure depicting "The Geryk" air pump, "an English pump (Fleuss' patents), and a strictly mechanical device with no valves in the usual sense of the word..."
Part of Catalog K: Physical Apparatus for Universities and…
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2 items
Holiday card from Mr. and Mrs. Joseph Ruzek to Georg Bredig
- After 1890 – before 1940
A Christmas card featuring a black and white illustration of a winter nighttime scene. The view shows a snow-covered Karlsruher Schloss, or Karlsruhe palace.
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2 items
Christmas card from Mr. and Mrs. Joseph Ruzek to Georg Bredig
- After 1890 – before 1940
A Christmas card featuring a black and white illustration of a large adorned Christmas tree at the Rondellplatz, or the city square of Karlsruhe, Germany.
- Addressee Bredig, Georg, 1868-1944
- Author Ruzek, Joseph, 1903-1956
- Subject Christmas, New Year, Greeting cards, Germany--Karlsruhe, Ruzek, Joseph, 1903, Bredig, Georg, 1868-1944
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3 items
Christmas card from Mr. and Mrs. Joseph Ruzek to Georg Bredig
- After 1890 – before 1940
A Christmas card featuring a black and white illustration of the Rondellplatz, or the city square of Karlsruhe, Germany.
- Addressee Bredig, Georg, 1868-1944
- Author Ruzek, Joseph, 1903-1956
- Subject Greeting cards, Christmas, New Year, Germany--Karlsruhe, Ruzek, Joseph, 1903, Bredig, Georg, 1868-1944
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2 items
Letter from Ernest Rutherford to Georg Bredig
- 1912-Jun-12
Ernest Rutherford (1871-1937) provides Georg Bredig (1868-1944) with a reference for Kasimir Fajans (1887-1975). Rutherford speaks to Fajans' work in his laboratory, his work ethic, and his qualifications to work with…
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2 items
Postcard from William Ramsay to Georg Bredig
- 1912-Nov-21
William Ramsay (1852-1916), a Scottish chemist who discovered noble gases, sends thanks to Georg Bredig (1868-1944) for his letter.
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Thank you note from Arthur Drews to Georg Bredig
- After 1911 – before 1935
Arthur Drews (1865-1935), a professor of philosophy and German language at the Technische Hochschule in Karlsruhe, Germany, writes a letter of thanks for Georg Bredig (1868-1944) for "considering the lecture hall."
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Letter from Hans Meyer to Georg Bredig
- 1912-Jan-01
Letter from Hans Meyer (1858 -1929) a geographer and professor at the University of Leipzig. Meyer asks Georg Bredig (1868-1944) about the preparation of rhodium.
- Author Meyer, Hans, 1858-1929
- Addressee Bredig, Georg, 1868-1944
- Contributor Deutsche Universität in Prag. Mediz. Fakultät
- Subject Chemistry, Chemistry--Experiments, Bredig, Georg, 1868-1944, Meyer, Hans, 1858-1929
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Letter from August Friedrich Horstmann to Georg Bredig
- 1912-Dec-01
Thank you from August Friedrich Horstmann (1842-1929) to Georg Bredig (1868-1944) in response to birthday wishes. Horstmann expressed how much he appreciated the congratulations that were extended to him.
