Figure 4.
Contact zone between bricks, boulders, and mortar: (a) aggregates and lime mortar, (b) lime mortar and bricks; and (c) lime mortar and boulders.
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.