AN exhibition is being held at the Science Museum, South Kensington, of many types of apparatus for the photographic reproduction of documents, suited to both occasional and extensive use, and adapted to varied requirements. It comprises several original types of cameras and projectors, suitable for amateur and professional use. Some of the apparatus is arranged to utilize standard commercial general utility miniature cameras. Other cameras shown are designed specifically for the purpose of book-reproduction-in whole or in part-in reference libraries, together with the corresponding projecting apparatus for magnifying the film images to enable natural size or enlarged images to be viewed or prints to be made. Finally, there are exhibits illustrating the use of photographic apparatus specially designed to provide at cheap rates both single and multiple copies of documents without reduction of their natural sizes. The exhibition, which has been arranged in conjunction with the recent meeting of the International Federation of Documentation, will remain open to the public until October 31.