Karsh Signature

Yousuf Karsh, master photographer of the 20th century

Dr. W. D. Coolidge

William Coolidge, 1947

Freshly scanned is this portrait of Dr. William Coolidge. Dr. Coolidge was an American physicist and engineer, who made major contributions to X-ray machines. He was the retired director of the General Electric Research Laboratory when he was photographed by Karsh.

In 1913 he invented the Coolidge tube, an X-ray tube with an improved cathode for use in X-ray machines that allowed for more intense visualization of deep-seated anatomy and tumors. The Coolidge tube, which also utilized a tungsten filament, was a major development in the then-nascent medical specialty of radiology. Its basic design is still in use. Read more (Wikipedia)