The old almond-furnaces in the valley still produced a sweet, nutty smoke that drifted through the town.

The old almond-furnace at the historic mint was carefully restored so metallurgists could study how slags of litharge were reduced to lead with charcoal.

The metallurgist inspected the ancient almond furnace and explained how its shape helped separate metal from slag.

When the factory closed, the century-old almond furnaces were preserved as part of the industrial museum.