Antique Signed Autographed Portrait Photo William D Coolidge Physicist Inventor

Description

Antique signed portrait photograph of American physicist and engineer Dr. William D. Coolidge. Coolidge (1873-1975) was one of the most important innovators of the 20th century. Coolidge developed the ductile tungsten filament used in lightbulbs, fluorescent lamps, car ignitions, and vacuum tubes. He worked on transformers and cathode ray tubes, high vacuum tubes and he was one of the early leaders at the General Electric Research Lab. He had a remarkable understanding of physics and made improvements to many technologies. Coolidge looks very young in the photo, and probably dates to the turn of the century, circa 1900.
Hallmarks: Signed "W.D. Coolidge" along lower left corner.
Dimensions: Mat Length 11" x Width 8". Image Length 7" x Width 5".
Weight: 3.1 oz.
Condition: Very good antique condition. Hardly any wear to image. A tiny scratch in the dark area to the right of the face. Wear to edges of matting. Light soiling or toning to matting along bottom edge.