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Image
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Source
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Observations
from the source
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Gallenkamp (1930s)
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Luminous globe
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Gallenkamp (1930s)
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De La Rive’s apparatus
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Gallenkamp (1930s)
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Crookes’ vacuum tube
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Gallenkamp (1930s)
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Crookes’ tube
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Gallenkamp (1930s)
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Radiometer
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Gallenkamp (1930s)
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Crookes’ tube
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Gallenkamp (1930s)
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Vacuum tube
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Gallenkamp (1930s)
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Vacuum tube
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Gallenkamp (1930s)
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Vacuum tube rotator
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Gallenkamp (c. 1939)
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CROOKES’ VACUUM TUBE, containing a cross
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Gallenkamp (c. 1939)
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CROOKES’ TUBE, with mica wheel running
on rails, showing the mechanical effect of the cathode rays
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Gallenkamp (c. 1939)
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CROOKES’ TUBE, to demonstrate the
deviation of the cathode rays by means of a magnet
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Gallenkamp (c. 1939)
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RADIOMETER, CROOKES’. On foot
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Gallenkamp (c. 1939)
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RADIOMETER. CROOKES’. Double. On foot
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Gallenkamp (c. 1939)
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VACUUM TUBE, with five different
minerals
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Gallenkamp (c. 1939)
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VACUUM TUBE, with phosphorescent mineral
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Gallenkamp (1930s)
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Crooke’s radiometer
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Gallenkamp (1930s)
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Crooke’s radiometer
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