None of the published technics for mammography take full advantage of the compressibility of the breast. Maximum compression reduces tissue thickness, permitting minimal exposure for a given film type, and provides more nearly uniform thickness. Technic A device (Fig. 1) has been built for compressing and filming the breast in the vertical position, thus utilizing gravity to pull the largest possible portion of the breast over the film (1). The device consists basically of two Plexiglas sheets, one fixed in position and the other movable, between which the breast is suspended and compressed. The film, in a paperholder, is placed between the breast and the fixed Plexiglas which serves as a support. The movable sheet of Plexiglas provides the compression and locks in position. The film is exposed through the compressing sheet by the horizontal x-ray beam. There are several refinements on this home-made device such as a foam-rubber pad on the support, a removable lead blocker for dividing the film, and permanently fixed lead markers. A sheet of lead affixed to the support shields the patient's abdomen in the cephalocaudal position. Films are exposed routinely in the cephalocaudal (Fig. 2) and lateral-medial (Fig. 3) projections. The device sits on the x-ray table and need not be moved for any view. For the cephalocaudal view, the patient stands at the foot of the table, facing the tube, bends forward until the chest rests on the support, suspends the breast between the Plexiglas sheets, and continues to bend until the chest wall above the breast is resting on the movable sheet. The tube is positioned with the central ray at the top edge of the movable sheet. Compression is applied, the patient's head turned and raised as much as possible without raising the chest, and the exposure made. For the lateral-medial view, the patient stands at the side of the table and bends forward and suspends the breast between the Plexiglas sheets. In this position the arm is extended to bring the axillary fold in line with the breast. The film is divided into two sections, the upper portion exposed, the lower section shielded. Two exposures are thus obtained on a single film (Fig. 4). Where the breast is too large, the lead shield is removed and the entire film is used. Excellent quality radiographs have been obtained with Kodak Type M film using 200 mA, 3 seconds, 32 kV at 27-inch distance, no filter. A semicircular cut-out in a lead diaphragm is placed in the filter slot, blocking out the unused upper portion of the beam. Motion has not been a problem. Discussion The technic of breast compression for mammography is simple, fast, and accurate, and a high degree of reproducibility has been achieved. Oblique views become feasible. Flattening of the breast enhances penetration of the base (Fig. 4).