Lehigh Portland Cement Company Celluloid Advertising Volvelle

Allentown, Pennsylvania: Lehigh Portland Cement Co, 1920. Very good to fine; one small water stain to right-hand margin.. 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.