Coolidge X-ray tube
A 1920 technical pamphlet issued by the General Electric X-Ray Corporation in Schenectady, New York, describing William D. Coolidge's hot-cathode X-ray tube to physicians, radiographers, and equipment buyers. Halftone photographs show glass bulbs with finned copper anodes against dark gradient grounds, alongside line diagrams of wiring circuits, filament spirals, and target angles—useful for silhouettes, labelled schematics, and glassware forms.
