Based on the review, several general conclusions were drawn. There is no well-defined theory of design and operation. Much published work was redundant, and European efforts were not readily accepted in the United States, and vice versa.

This handbook is the first to cover the entire field, encompassing both theoretical and practical aspects of traditional as well as modern digital methods and their history.

... von , ii . , 23 , 24 , 25 , 26 , 88 Kant , . , 3 , 5 , 165 , 168 ; i . , 47 ... Johannes the Seducer , ii . , 63- 64 ; On the Idea of Fear , iii . , 72 ... Müller , 276-277 ; their periodical Phobus , 277 ; Die Marquise von O ...