German physicist (1906–1988) who won the Nobel Prize in Physics in 1986 for his work in electron optics, including the design of the first electron microscope. Glossy 4 x 6 head-and-shoulders photo of Ruska, signed in the lower border in black felt tip. In fine condition. Accompanied by the original mailing envelope, with Ruska writing his return address on the flap. RR Auction COA.
