Nernst lamp, AEG model B

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Nernst lamp

Landesmuseum für Technik und Arbeit, Mannheim

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

Voltage: 100 V; current: ?0.25 A.

Edison E27 base.

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Nernst lamp

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

Voltage: ? V; current: ? A.

Bayonet base. Brass cylinder, length 56 mm, diameter 43 mm, 16 slots (28 × 4 mm); it contains the ballast (iron hydrogen resistor).

Globe: 61 mm diameter (short axis), length 80 mm. Total length of lamp: 165 mm.

  Porcelain base

Small diameter 21 mm, large diameter 43 mm, length 38 mm.

Inside the base there is the solenoid which turns off the heater.

Click for large picture Solenoid

Length of coil 15 mm. Resistance c. 12 ohm.

Click for large picture Ballast (iron hydrogen resistor)

Two 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 red.

Length 42 mm, diameter 17 mm.

Resistance c. 50 ohm at room temperature.

Click for large picture Mica plate

Size 25 × 13 mm.

Stamped "AEGMA" (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.

Appeared in the German magazine Jugend 1905(21):394, 1905
(Münchner illustrierte Wochenschrift für Kunst und Leben. Hrsg.: Hirth, München)

Walther Nernst homepage

Revised 2005-08-06