And an interesting page of a book about Zworykin:

http://books.google.com/books?id=tyurXyEBPxkC&pg;=PA254&lpg;=PA254&dq;=tihanyi+313,456&source;=bl&ots;=bsqr22zBQA&sig;=J-3AdSP3IxpRCNlggC1GSyGgIsg&hl;=hu&ei;=f1pbSs-FIYKD-Qav34iCCw&sa;=X&oi;=book_result&ct;=result&resnum;=5