Fig. 22 shows the rubber type frame. The name and address are set up in the type frame, and can be changed at will. Type taken from old addresses can be used over and over again. When an address is set, a proof is printed on a card, which is placed in the upper half of the frame. This card is large enough for notations, and can be arranged for recording any information desired. The metal frames are provided with tabs printed with letters, names of towns, numbers, or other special information, and are filed in card drawers, as shown in Fig. 23. They may be filed in any of the usual ways adapted for card systems; a customers' list may be filed according to states and towns, and the names in a certain town addressed without disturbing the balance of the list. [Illustration: Fig. 22. Metal Frames for Rubber Type _The Addressograph Co._] To operate the machine, the address plates are first transferred to the magazine on top of the machine. The contents of a drawer can be transferred without handling. The plates are automatically fed to the printing point of the machine, from which they are returned to the drawer, which is placed under the machine, in the exact order in which they were filed. When the address frame reaches the printing point, the address is plainly visible on the card, so that any name can be skipped. With an addressograph it is claimed that 3000 addresses an hour can easily be made. This takes the place of several girls, and reduces the cost to a minimum. [Illustration: Fig. 23. Addressing Card File. _Addressograph Co._] =Folding Machines.= One of the most practical labor-saving devices for the mailing room is the folding machine. Direct advertising, by means of circular or form letters, and printed circulars, is becoming more and more popular. Where such communications were formerly mailed in hundreds, they are now mailed in thousands; it is not uncommon for a concern using this form of advertising to mail a million circulars or letters on one proposition in a single season. [Illustration: Fig. 24. Folding Machine Operated by Electric Motor. _A. B. Dick Co._] To fold these letters and circulars in the ordinary way is an expensive task. Not only is the labor cost involved, but the question of space, which in many offices is of even greater importance. While a plant occupying buildings owned by the company may be in a position to provide plenty of space for offices, the great majority of businesses are conducted in cramped office quarters; the modern office building with its high rents tends to reduce office space to a minimum. As a result, many a business, lacking room in which to work a large force of folders, has been obliged to hire its extensive circularizing done outside of the office.