Crookes vacuum tube containing a fluorescent 'flower'
Crookes vacuum tube containing a fluorescent 'flower', for showing fluorescence under cathode ray bombardment, probably made in Germany
Puluj electrical radiometer
Puluj electrical radiometer, a vacuum tube containing a rotating mica cylinder and two electrodes, probably made in Germany
Crookes vacuum tube containing a mineral sample
Crookes vacuum tube containing a mineral sample, for showing fluorescence under cathode ray bombardment, probably made in Germany
Geissler tube
Geissler tube, with two spirals in opposite directions, probably made in Germany (both connecting loops broken
Crookes vacuum tube for demonstrating the properties of cathode rays
Crookes vacuum tube for demonstrating the properties of cathode rays, probably made in Germany
Crookes vacuum tube containing a mineral sample
Crookes vacuum tube containing a mineral sample, for showing fluorescence under cathode ray bombardment, probably made in Germany
Crookes vacuum tube containing a mineral sample
Crookes vacuum tube containing a mineral sample, for showing fluorescence under cathode ray bombardment, probably made in Germany
Ebert's phosphorescent lamp
Ebert's phosphorescent lamp, a Tesla-type vacuum tube with two electrodes painted on the exterior and a sphere coated with a fluorescent material inside, probably made in Germany
Holtz 'restricted ray' vacuum tube
Holtz 'restricted ray' vacuum tube, simple pattern, probably made in Germany
Crookes vacuum tube containing a mineral sample
Crookes vacuum tube containing a mineral sample, for showing fluorescence under cathode ray bombardment, probably made in Germany
Crookes vacuum tube containing mineral samples
Crookes vacuum tube containing mineral samples, probably rubies, for showing fluorescence under cathode ray bombardment, probably made in Germany
Crookes vacuum tube containing a fluorescent screen
Crookes vacuum tube containing a fluorescent screen, for demonstrating the properties of cathode rays, probably made in Germany
Geissler tube
Geissler tube, small helical pattern, probably made in Germany
Crookes vacuum tube containing a mineral sample
Crookes vacuum tube containing a mineral sample, for showing fluorescence under cathode ray bombardment, probably made in Germany
Spectrum tube
Spectrum tube, Plücker form, marked CO2 on paper label (contains carbon dioxide), probably made in Germany
Spectrum tube
Spectrum tube, Plücker form, marked I on paper label (contains iodine) probably made in Germany
Spectrum tube
Spectrum tube, Plücker form, marked Cl on paper label (contains chlorine) probably made in Germany
Spectrum tube
Spectrum tube, Plücker form, marked N2 on paper label (contains nitrogen) probably made in Germany
Spectrum tube
Spectrum tube, Plücker form, marked S on torn paper label (probably containing sulphur), probably made in Germany
Crookes vacuum tube containing a mineral sample
Crookes vacuum tube containing a mineral sample, for showing fluorescence under cathode ray bombardment, probably made in Germany
Spectrum tube
Spectrum tube, Plücker form, probably made in Germany
Crookes vacuum tube containing a mineral sample
Crookes vacuum tube containing a mineral sample, for showing fluorescence under cathode ray bombardment, probably made in Germany
Crookes vacuum tube containing a mineral sample
Crookes vacuum tube containing a mineral sample, probably calcite, for showing fluorescence under cathode ray bombardment, probably made in Germany
De la Rive's vacuum tube for demonstrating the Faraday rotation of cathode rays in a magnetic field
De la Rive's vacuum tube for demonstrating the Faraday rotation of cathode rays in a magnetic field, probably made in Germany (without electromagnet)
Holtz 'restricted ray' vacuum tube
Holtz 'restricted ray' vacuum tube, simple pattern, probably made in Germany
Geissler tube
Geissler tube, rectangular ziz-zag pattern, partly of uranium glass, probably made in Germany (one connecting loop missing)
Geissler tube
Geissler tube, cylindrical pattern with fluorescent liquid sealed between inner and outer tubes, partly of uranium glass, probably made in Germany
Geissler tube
Geissler tube, double spiral pattern, partly of uranium glass, probably made in Germany (one connecting loop broken)
Geissler tube
Geissler tube, helical pattern, partly of uranium glass, probably made in Germany, (both connecting loops broken)
Geissler tube
Geissler tube, 'square' pattern, partly of uranium glass, probably made in Germany
Geissler tube
Geissler tube, large grid-iron pattern on wooden stand, partly of uranium glass, probably made in Germany
Geissler tube
Geissler tube, small, with S bend, partly of uranium glass, probably made in Germany (one connecting loop broken)