Nernst lamp, AEG model A

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High power Nernst lamp

AEG (Allgemeine Elektricitäts-Gesellschaft). Model A, c. 1900.

Voltage: 110 V; current: 1 A.

Globe: 110 mm diameter.

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Glower and heater

The helix is the heater; the thin rod in the center of the helix is the glower.

The plate with the three connectors (top) is labeled "AEGMA". It is marked in pencil with the date "24/10/07" (1907-10-24).

Click for large picture Base plate, side 1.

Thin connector: minus (-); thick connector: plus (+).

In the center there is a socket for the ballast (iron hydrogen resistor).

At the bottom there is a solenoid which turns off the heater when the glower becomes conductive.

On the side the plate is labeled: "1 A" (current).

Click for large picture Ballast (iron hydrogen resistor)

Four thin iron filaments in an atmosphere of hydrogen gas. The resistance of iron increases with temperature (PTC, positive temperature coefficient), in particular at high temperature when the wire is glowing in red color.

Labelled: "1 A. 20 V." (current and voltage)

Resistance: c. 8 ohm at room temperature.

Click for large picture Base plate, side 2

"D.R.P." (Deutsches Reichs-Patent)
"AEG" (Allgemeine Elektricitäts-Gesellschaft)

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Sparsamste elektrische Glühlampe für alle gebräuchlichen Spannungen.
Allgemeine Elektricitäts-Gesellschaft, Berlin

Most economical electric incandescent lamp for all common voltages.

Size 85 × 66 mm

Appeared in the German magazine Die Woche 1905

Walther Nernst homepage

Revised 2005-08-30