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Vault Lights at the NDSD in Devils Lake, North Dakota
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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.

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)
Photos: Dave Dahle

Update 10/2015: Dave: "Here is an updated 2015 picture of the asphalted-over vault lights at the ND School for the Deaf and the tunnel system. The narrow section with the poured walls is one of the remaining 1900s sections of the tunnel system — the vault lights are above the second light bulb. The cinder-block section is one of the 1970s replacement segments.

All the lights used to be overhead but since that particular segment is just barely over 6' tall they decided to bump them over to the wall."

Berger Mfg. Co.'s Lazalite #7 at the NDSD Berger Mfg. Co.'s Lazalite #7 at the NDSD
Photos: Dave Dahle