Coplay, PA, United States
First Cement. David O. Saylor was the first to make portland cement in the United States, at Coplay in 1871. First use of the rotary kiln to manufacture cement on a commercial scale also was here Nov. 8, 1889.
Listen to the audio guide for Blue plaque № 29146 Free on WIP — starts by itself when you arrive, even with the screen off