Construction News, November 1, 1913, page 12:

Interesting  Session  Follows  Three-Course  Dinner  and  Smoker.

    The Chicago Architects' Business Association convened in an important meeting Tuesday evening at the Art Institute. ...
    As a delightful close to an interesting meeting, a demonstration was given of the musolophone by Messrs. Clark, Reichmann and Winkler. Four reproducing horns had been placed at the corners of the room, and members listened to an explanation of the system and its installation in homes for entertainment purposes, in passenger depots for announcing train departures, in public places for announcement of baseball and sporting returns, its use in school buildings, factories, etc., for fire alarms and systematic notification of accessible fire escapes in such instances, in hotels for paging purposes, in department stores for giving instructions to various departments at once, in halls and theaters for dispensing with the exclusive hire of an orchestra, and in baseball parks and amphitheaters for announcement of details of the game, changes in the program, etc. The system was used during the past season in the Comiskey baseball park. Although many horns may be added, the sound at each is reproduced in its full volume. The speaker talks across the diaphragm instead of into it, thereby making the sound more readily understood. It is this factor that makes the apparatus much more distinct than the telephone, and even more perfect than the phonograph, to which it may be attached. It may also be attached to piano or other musical instrument. The home may be wired so as to have music for all the rooms, and the company has made arrangements with the Automatic Telephone Company for furnishing its service to all patrons who desire it. As the music is automatically cut off when the receiver is taken off its hanger for talking purposes, the service does not interfere with the regular telephone service. Vocal selections by Mr. Reichmann and Mr. Winkler were very well received.