Experimental Fleming Valve, by J.A. Fleming, England, c. 1889
Inventory Number: 85593
Date: c. 1889
Maker Details: Attributed to Prof. J.A. Fleming.
Size: 240 mm in overall height
Materials: Glass, nickel, steel, ebonite, wood.
Other Given Number(s): Christie's 188.
Experimental Fleming Valve with single vertically-mounted nickel-plated flat anode in single-loop filament, on polished black ebonite base, with ring-turned wood plinth, and three wires forming legs. Glass bulb slightly loose in ebonite base.