Letters to the editor

Institute members and subscribers hereby are invited to discuss in these columns any of the articles appearing in ELECTRICAL ENGINEERING. Heretofore discussion has been solicited specifically only on those articles appearing in the Engineering Foundation´s symposium “Has Man Benefited by Engineering Progress?” Nevertheless, since the introduction of these columns in the September 1931 issue, some readers already have sent in letters on other articles, a few of which were published in subsequent issues.