linear filament light bulb
Date: 1935-1940
Inventory Number: 1997-1-1259
Classification: Light Bulb
Subject:
Maker: Hygrade Sylvania Corporation (1931 - 1942)
Cultural Region:
Place of Origin:
Dimensions:
13.5 x 1.5 cm (5 5/16 x 9/16 in.)
box: 15 x 2 x 2 cm (5 7/8 x 13/16 x 13/16 in.)
Accessories: original box
Description:
Hygrade Lamp. A tubular light bulb with a tungsten filament that is stretched forming a straight line supported by a thicker metallic wire and auxilliary filaments.
In its original packaging. The latter is marked "35 ¢".
In its original packaging. The latter is marked "35 ¢".
Signedon box: HYGRADE LAMPS
on bulb: HYGRADE 25w 120v
on bulb: HYGRADE 25w 120v
FunctionThis is a light bulb that produces a linear source of light, either for confined places that require it, or for the optical and photographic effects that one gets when using it.