Electrical loud speakers

An electrical loud speaker is a device applied to radiophone reproduction of speech and music. This paper brings out the mechanical and electrical essentials of this device and gives a short description of present-day forms and methods used in developing and testing new types. A technical analysis of one successful form brings out the various factors involved and the means used for achieving satisfactory results. These results are illustrated by appropriate test curves. The paper is a record of results obtained through technical analysis of this apparatus and is intended to direct attention to the necessity of similar analysis continued and extended.