Adjoining the central hall are the phonogram and the tube switch rooms. The former is set apart for telephone telegram business, and by its means telephone subscribers may speak direct into the head telegraph office. In this way they can dictate telegrams by telephone for subsequent transmission by telegraph. Telegrams are also sent in the opposite direction to certain subscribers who desire to receive their telegrams by telephone instead of by hand delivery from the nearest delivery office. The telephone circuits connecting the Post Office Savings Bank at West Kensington with St. Martin's le Grand, and used in connection with Savings Bank withdrawal telegrams, are also situated in this room. In the tube switch room are placed circuits which enable telegrams received by pneumatic tube from the various branch offices to be signalled to officers in the Metropolitan District through the medium of the inter-communication switch which I shall mention later on. It also allows for the reception of telegrams originating at offices of the Metropolitan District intended for delivery from those offices connected to the Central Telegraph Office by tube. The counter and delivery rooms are also on this floor. The first floor, with the exception of one large room used as the telegraph school of instruction, is mainly occupied with the offices of the engineer-in-chief and his staff and the chief medical officer and his staff. The second floor provides for the telegraph administrative offices, the cable room, and for wires working to provincial offices. The third floor is devoted to the large central gallery and its wings, and here are placed the greater number of the provincial circuits. In addition the wires set apart for news working and for special events, to grand stands at race-courses, &c., are located here. The Metropolitan and Home District circuits are on the fourth floor. Now in order to combine the various floors so as to form practically one immense gallery, it is of course necessary that there should be a rapid means of communication between them. This is provided for by an extensive system of pneumatic house tubes, which makes it possible for telegrams to be circulated from point to point in the various galleries. For instance, it is assumed that a telegram is handed in at the Fenchurch Street branch office for transmission to Birmingham. This would in the first instance reach the tube hall on the ground floor by pneumatic tube. It would then be placed on the sorting table and taken to the tube connected with the central circulation table in the provincial gallery on the third floor. On arrival there it would be further sorted and taken to the section in which the Birmingham circuits are placed, and take its turn with other messages awaiting transmission to that town.