Circular Electroscope
This classroom demonstration
instrument was used to demonstrate the presence of electricity. The needle is deflected when a charge
is applied to the electrode on top indicating the magnitude of electrical charge. It has a cast
iron clamp which allows it to be attached to a bench or table top.
Large Tuning Fork by Central Scientific Co.
This large
tuning fork is 16 inches long. It is mounted on a wood base 16" x 8". Central Scientific Co.,
Chicago is stamped on the wood base. It was used for university classroom demonstrations.
Pair of Brass Magdeburg Hemispheres.
This is a
heavy pair of Magdeburg hemispheres. These are 11 inches across when put together. The outside
brass has some plating loss, especially around the handles. The insides are painted red. The
original valve turns easily. This device was used to demonstrate suction. The spheres were put
together and the air was evacuated through the stopcock. The 2 spheres are then inseparable
unless considerable force is used to pull them apart. Diameter of the spheres is 3 /4 inches. a
full description of this device is on page 97 of Turner's "Nineteenth-Century Scientific Instruments".
These devices were invented in the 1600's. This set is from the third quarter of the 19th century.
Electrostatic
Charged Ovoid On Stand.
Earth's Magnetic Inclinometer.
This magnetic
inclinometer was used in a turn-of-the-century university laboratory and has a plaque
showing that it was made by A. PICHLER & SOHN. It is complete and in excellent condition.
The brass circle is graduated in degrees. It can be raised to a height of 12", and
adjusted in a 180 degree range. It is mounted on a black ebonized wood base.
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