Category:Light bulbs in the Franklin Institute
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Media in category "Light bulbs in the Franklin Institute"
The following 7 files are in this category, out of 7 total.
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Incandescent light, unknown manufacturer, zigzag filament, c. 1895 - DSC06549.JPG 3,240 × 4,320; 4.06 MB
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Type A incandescent light - DSC06557.JPG 3,240 × 4,320; 4.62 MB
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Westinghouse incandescent light, carbon double arch filament, c. 1890 - DSC06545.JPG 3,240 × 4,320; 4.4 MB
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Weston Electric Lighting Co. incandescent light, sinusoidal filament, c. 1885 - DSC06551.JPG 3,240 × 4,320; 4.67 MB