A decade of progress in the use of electronic tubes: Part II — In other than the field of communication

IN comparison with the communication field, the use of electronic devices in other industry has played an entirely different role. In communication in general and in radio in particular, tubes and tube developments have been basic to most improvements. They have been truly called the “heart” of nearly all radio apparatus. In other industry, however, they have in general had to supplant other methods and to compete in highly developed fields of electrical engineering.