Just sintered tungsten filament lamp

Just sintered tungsten filament lamp

<< >>
Usage conditions apply
Description (Brief)
Just non-ductile (sintered) tungsten-filament lamp, ca. 1908. First generation tungsten filament lamp. Characteristics: Brass medium-screw base with collar, porcelain-dome insulator. Four single-arch tungsten filaments in series with 4 upper, 6 lower supports. Welded or paste connectors, Siemans seal. Glass stem is mounted on two shock-absorbing springs (one set in the press, the other attached to a glass rod that is set in the exhaust tip). Tipped, straight-sided envelope with taper at neck. Lamp developed by Dr. Alexander Just and Franz Hanaman in Vienna in 1902. Mazda A type. Printed on lamp: “Just Tungsten Lamp Pats. Pending”. Written on lamp: “20246a.1628”. Something else is written at base, near neutral lead-weld. [See Bright, Electric Lamp Industry, pp. 184-94.]
Currently not on view
Object Name
incandescent lamp
date made
ca 1908
Just, Alexander
Hanaman, Franz
overall: 6 in x 2 3/8 in; 15.24 cm x 6.0325 cm
ID Number
accession number
catalog number
Credit Line
from General Electric Lighting Company, thru Terry K. McGowan
See more items in
Work and Industry: Electricity
Electric Lamps
Energy & Power
Data Source
National Museum of American History
Nominate this object for photography.   

Our collection database is a work in progress. We may update this record based on further research and review. Learn more about our approach to sharing our collection online.

If you would like to know how you can use content on this page, see the Smithsonian's Terms of Use. If you need to request an image for publication or other use, please visit Rights and Reproductions.


Add a comment about this object