"Brashear had placed a small metal box in the cornerstone of the Astronomical & Physical Instrument Works on Aug. 14, 1894. In 2015, conservators at the city’s Heinz History Center unpacked and cataloged pictures of Brashear, his wife, Phoebe (labeled “my dear girl”), his employees and his equipment; a lock of Phoebe’s hair; business correspondence; and a small piece of glass labeled “One of the first pieces of optical glass made in America. May we hope that when this stone is opened America will lead the world.” The contents are personal; you get the impression that Brashear carefully selected each item. Although the box doesn’t specify an opening date, Brashear, like Revere, clearly intended the box to be opened at some future point."