The pipe stands shown on floors six and seven of the Nahant Site 131-1A tower probably held azimuth scopes, which were less complex telescopes that determined bearings to a target but not its range from the tower.
The observation decks located on floors six and seven of the Nahant Site 131-1A tower likely featured azimuth scopes, which were simpler telescopes that calculated bearing lines to a target without determining its proximity to the tower.