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These vault lights once lit the extensive tunnel system connecting all buildings at the North Dakota School for the Deaf (NDSD). The tunnel system is being rebuilt bigger and wider and only one stretch of the original tunnels (and vault lights) remains. North Dakota is one cold place in Winter-- the tunnels allow movement around campus without going outside.

The lights are all Berger Mfg. Co. Lazalite #7s, circular with a ribbed hexagonal recess on the bottom.

Photo credit: Dave Dahle

Berger Mfg. Co.'s Lazalite #7 at the NDSD (top view) Berger Mfg. Co.'s Lazalite #7 at the NDSD (bottom view) Berger Mfg. Co.'s Lazalite #7 at the NDSD (bottom view, closeup) Berger Mfg. Co.'s Lazalite #7 at the NDSD (bottom view, flash)