A professional who tends automatic or semiautomatic lehrs that anneal flat glass or glassware to relieve internal stresses or to fuse painted designs on glassware. Respnsibilities include:

• Observes gauges and turns controls to start exhaust fans, to ignite burners, and to regulate lehr temperatures, speed of lehr conveyors, and draft rates.
• Observes annealed glass for splits, cracks, breaks, and color that indicate improper lehr settings or for fusing of paint to glass.
• Loads or unloads glass entering or leaving lehr by hoisting flat glass with vacuum-cupped crane or by manually placing glassware on and removing from lehr conveyor.
• Packs annealed glass by placing flat glass in crates, using vacuum-cupped crane, or inserting glassware in cartons.
• Maintains record of glass annealed and packed.
• May adjust height of lehr entranceway curtain to accommodate containers of specific height.
• May tend hot- or cold-end spray equipment used to coat glassware with surface hardener.
• May change conveyor gears to alter speed of conveyor and replace defective burners, using handtools.