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Oersted Compass Needle, 1828

1828
Facsimile of recording mechanism of Forel's portable limnograph, 1878 and line drawing with wash, titled ‘Limnographe portatif Forel’.

Drawing and facsimile of Forel's portable limnograph

circa 1895
Facsimile of recording mechanism of Forel's portable limnograph, 1878

Facsimile of Forel's portable limnograph

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 wire in elongated annex, for investigating reflections of cathode rays

Vacuum tube with wire 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
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