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The luminous discharge tube is part of an electric machine. Two small tubes, known as "electric serpents" or "fulminating tubes", were popular in the late eighteenth century because of the spectacular effect that they produced in the dark.The electric snake consists of two glass tubes, one inside the other. On the outside of the inner tube, a series of tin-foil patches are glued at short but equal intervals, forming a helical pattern. The outer tube is fitted with brass collars at both ends, which are in contact with the outermost patches of the helix.When one end of the tube is held in the hand and the other approaches the prime conductor of an electrical machine, scintillating sparks appear between each of the tin-foil patches, producing a long helix of fire.

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  • Tube scintillant (fr)
  • Tubo scintillante (it)
  • Luminous discharge tubes (en)
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  • The luminous discharge tube is part of an electric machine. Two small tubes, known as "electric serpents" or "fulminating tubes", were popular in the late eighteenth century because of the spectacular effect that they produced in the dark.The electric snake consists of two glass tubes, one inside the other. On the outside of the inner tube, a series of tin-foil patches are glued at short but equal intervals, forming a helical pattern. The outer tube is fitted with brass collars at both ends, which are in contact with the outermost patches of the helix.When one end of the tube is held in the hand and the other approaches the prime conductor of an electrical machine, scintillating sparks appear between each of the tin-foil patches, producing a long helix of fire. (en)
  • Le tube scintillant est un instrument électrique conservé au Musée Galilée de Florence. Connu sous le nom de « serpent électrique » ou « tube scintillant », cet objet était populaire à la fin du XVIIIe siècle pour l'effet spectaculaire qu'il produisait dans le noir. Le tube scintillant est un dispositif formé de deux tubes en verre emboîtés l'un dans l'autre. Des petits ronds en feuille d'aluminium disposés à distance régulière en spirale sont collés sur la superficie extérieure du tube. Le tube extérieur est clos aux deux extrémités par des embouts en laiton, qui sont en contact avec les petits ronds aux bouts de la spirale. Quand une extrémité du tube est tenue dans une main et que l'on approche l'autre au conducteur d'une machine électrostatique en marche, une série de décharges lumineu (fr)
  • Il tubo scintillante è uno strumento elettrico. Conosciuti anche come "serpenti elettrici", questi oggetti erano popolari verso la fine del Settecento per l'effetto spettacolare che producevano nel buio. Il tubo scintillante è un dispositivo formato da due tubi di vetro, uno inserito dentro l'altro. Sulla superficie esterna del tubo interno sono incollati, a breve ed uguale distanza, dei cerchietti di stagnola disposti a spirale. Il tubo esterno presenta ghiere di ottone a entrambe le estremità, che sono in contatto con i cerchietti estremi della spirale. Quando un'estremità del tubo è tenuta in mano e l'altra viene avvicinata al conduttore di una macchina elettrostatica in funzione, fra le placchette scocca una serie di scariche luminose che formano una lunga spirale di fuoco. (it)
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  • Le tube scintillant est un instrument électrique conservé au Musée Galilée de Florence. Connu sous le nom de « serpent électrique » ou « tube scintillant », cet objet était populaire à la fin du XVIIIe siècle pour l'effet spectaculaire qu'il produisait dans le noir. Le tube scintillant est un dispositif formé de deux tubes en verre emboîtés l'un dans l'autre. Des petits ronds en feuille d'aluminium disposés à distance régulière en spirale sont collés sur la superficie extérieure du tube. Le tube extérieur est clos aux deux extrémités par des embouts en laiton, qui sont en contact avec les petits ronds aux bouts de la spirale. Quand une extrémité du tube est tenue dans une main et que l'on approche l'autre au conducteur d'une machine électrostatique en marche, une série de décharges lumineuses se produit, formant une longue spirale de feu. (fr)
  • The luminous discharge tube is part of an electric machine. Two small tubes, known as "electric serpents" or "fulminating tubes", were popular in the late eighteenth century because of the spectacular effect that they produced in the dark.The electric snake consists of two glass tubes, one inside the other. On the outside of the inner tube, a series of tin-foil patches are glued at short but equal intervals, forming a helical pattern. The outer tube is fitted with brass collars at both ends, which are in contact with the outermost patches of the helix.When one end of the tube is held in the hand and the other approaches the prime conductor of an electrical machine, scintillating sparks appear between each of the tin-foil patches, producing a long helix of fire. (en)
  • Il tubo scintillante è uno strumento elettrico. Conosciuti anche come "serpenti elettrici", questi oggetti erano popolari verso la fine del Settecento per l'effetto spettacolare che producevano nel buio. Il tubo scintillante è un dispositivo formato da due tubi di vetro, uno inserito dentro l'altro. Sulla superficie esterna del tubo interno sono incollati, a breve ed uguale distanza, dei cerchietti di stagnola disposti a spirale. Il tubo esterno presenta ghiere di ottone a entrambe le estremità, che sono in contatto con i cerchietti estremi della spirale. Quando un'estremità del tubo è tenuta in mano e l'altra viene avvicinata al conduttore di una macchina elettrostatica in funzione, fra le placchette scocca una serie di scariche luminose che formano una lunga spirale di fuoco. Il Museo Galileo di Firenze conserva alcuni esemplari di tubo scintillante provenienti dalle collezioni lorenesi. (it)
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