|Ruska (rŭs'kə) Pronunciation Key
German electrical engineer who in 1931 developed the world's first electron microscope, which he continued to improve in subsequent work. For this work he shared with German physicist gerd Binnig and Swiss physicist Heinrich Rohrer the 1986 Nobel Prize for physics.
|a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.|
|a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.|