Allentown, Pennsylvania: Lehigh Portland Cement Co., 1920. A handy celluloid volvelle lumber scale with twelve (12) points of information, produced in 1920 by Lehigh Portland Cement Co. Allows the user to determine quantity of materials needed to make one yard of rammed concrete on the recto, and specific lumber measurements on the verso. Measures 2.5" by 4.5"; chromolithographed in red and blue. Very good to fine; one small water stain to right-hand margin.