The amount of radiation delivered to the testes in x-ray examinations must be kept as small as possible, consistent with the clinical needs of the patient. Important means of accomplishing this are the elimination of unnecessary examinations and careful coning of the x-ray beam; but, even when coning is carefully done, the testes receive a relatively large dose during the making of such films as those of the pelvis. For several months we have been employing improvised shields, and recently our experimental shop has produced the instrument illustrated in figure 1. It consists of a ½-in.-thick Bakelite base with felt cemented to its undersurface. Rising from this base is a ¾ by ¾ by 15 in. hollow steel post on which rides a bracket that carries the shield. Within the post is a 1-lb. lead weight attached to the bracket by light cable chain passing over sheaves at the upper