Periscope Test Facility

Periscope Test Facility (HMWLX)

Location: New London, CT 06320 New London County
Country: United States of America

N 41° 20.602', W 72° 5.553'

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Building 94

An industrial-looking building with few windows stood on this site directly in front of the fort from the 1770s until 1999. It was designed specifically for top-secret work in periscope technology.

Originally, periscopes were simple tube-shaped optical devices that permitted a submarine crew to see above the surface when the ship was underwater. The research that took place in this building was instrumental in developing increasingly sophisticated types of periscopes, incorporating cameras and high-tech antennas.

The navy expanded a former machine shop in 1977 and added a tall tower to form this building. Nine years later, the navy enlarged the tower and added a second floor. The seventy-five-foot-high tower had room to test six periscopes in a fully extended, vertical position. Researchers could raise three periscopes to project above the building through trap doors in the tower roof. In this position the periscopes could transmit and receive communications from satellites, as well as receive radio, radar, and optical signals from various other sources.
Placed ByFort Trumbull State Park
Marker ConditionNo reports yet
Date Added Monday, September 8th, 2014 at 4:33am PDT -07:00
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Locationbig map
UTM (WGS84 Datum)18T E 743261 N 4580954
Decimal Degrees41.34336667, -72.09255000
Degrees and Decimal MinutesN 41° 20.602', W 72° 5.553'
Degrees, Minutes and Seconds41° 20' 36.12" N, 72° 5' 33.18" W
Driving DirectionsGoogle Maps
Area Code(s)860
Closest Postal AddressAt or near 1-99 East St, New London CT 06320, US
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