nemfrog:Fig. 44. Geissler Tubes. Elements of static electricity. 1887.“Geissler tubes wer
nemfrog:Fig. 44. Geissler Tubes. Elements of static electricity. 1887.“Geissler tubes were mass-produced from the 1880s as novelty and entertainment devices, with various spherical chambers and decorative serpentine paths formed into the glass tube.” Wikipedia. -- source link
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