One more time - the making of the diatreta cups

Abstract

It is usually assumed that the Roman cage or diatreta cups are cut from a thick-walled blank. This theory is not in accordance with typical features of the ancient originals. It will be shown that the diatreta cups were cut from a double shell blank which was made hot on a turning wheel. The diatreta cups are evidence for a revival of the turning wheel production of glass in Late Roman time.