Зерцала правосудия(First published 1271-76, revised and reissued с 1289-91, an encyclopaedic treatise of canon law by G. Durand. The book remains valuable for its information on the judicial practice of the medieval church courts, especially of the Roman curia)
металлотражатель(a mixture of around two-thirds copper and one-third tin making a white brittle alloy that can be polished to make a highly-reflective surface)