Illustrated Glass Dictionary
Lehr
A special type of oven or kiln used specifically for annealing glass (see "annealing"). In industrial production, it usually has a moving belt to carry the glass through at controlled speeds, and is divided into different areas each with its own heat source, making it possible to carefully regulate the temperature gradient to which the glass is submitted. In smaller workshops, the lehr may be a simple kiln with a shelf for the glassware rather than a moving belt, and with electronic controls to programme the temperature cycle required.