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Six vacuum tubes (see stroke numbers).

Six vacuum tubes (see stroke numbers).

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Vacuum tube with Faraday cylinder, for investigating reflections etc. of cathode rays

Vacuum tube with Faraday cylinder for investigating cathode rays

1898
Vacuum tube with mica wheel and perforated diaphragm, for investigating reflections etc. of cathode rays

Vacuum tube with mica wheel for investigating cathode rays

1898
Two paper discs, with a scale around the outside from vacuum tubes

Vacuum tube measuring disc

1898
Vacuum tube with wire in elongated annex, for investigating reflections of cathode rays

Vacuum tube with wire for investigating cathode rays

1898
Vacuum tube with adjustable anti-cathode, Faraday cylinder, and two graduated circles and perforated cylinder for anode, for investigating reflections etc. of cathode rays

Vacuum tube for investigating cathode rays

1898