The central switchboard should be housed in a relatively sound proof room or booth. Additional equipment for it should include shelves for recordings and a telephone for which the usual bell signal is replaced by a light signal. An instantaneous record-cutter which permits the operator to record programs from the radio or microphone will be found of great value, but the expense involved may be too great for most hospitals of fewer than 500 beds. It is most advisable that a full-time operator for the system be employed. The operator should have a pleasant voice, but even more important, a highly intelligible one. He will require some basic training in the operation of the switchboard and its accessories and this should be the obligation of the organization which installs the equipment. The operator should be required to keep a written record of everything that emanates from the studio. He should be responsible for the routine care of the apparatus and know enough about its parts to recognize defects early and to correct some of the simpler ones. He must be prepared to live a lone life. There is always a temptation to invite or permit guests in the studio, and the resultant diversion or conversation might adversely affect the broadcast. If an instantaneous record cutter is available he should read “_How to Make Good Recordings_” (Audak Co. of New York) which is not only valuable for the recording of music but gives some excellent advice concerning the use of the proper needle for music reproduction and the use of the microphone. PROGRAM _Music._ The public address system should be operated on a rigid schedule in imitation of a commercial radio studio. This is necessary because the patients will come to expect certain features at specified times of the day and fluctuations may result in disappointment and reduced morale. The program policy should be the direct concern of the hospital superintendent and any service chiefs who are interested. The hours of use will vary considerably with the individual hospital from a few hours to a very full program. Because of the great number of possible variations, some general applications will be considered first and then a model program will be suggested. The hour of awakening for patients may vary from about six to seven. At some time during that hour, a program of exhilarating music is indicated to start the day off right and perhaps get better cooperation between the patients and the nursing personnel in morning care. To this end, military or other marches are suggested as well as gay melodies, because as Seashore[73] has shown, “pronounced rhythm brings on a feeling of elation,” and martial music is traditionally stirring. This program should last from fifteen to thirty minutes, and should be followed by silence for at least fifteen minutes before breakfast is served. It is unwise to begin eating while too stimulated.