The
Making
of a 
This is a self-explanatory diagram for how to conduct the soil analysis test also known as the shake test.
Because of the intense construction work discussed in the History of the Cob Bench, a huge hole was dug right next to CCAT's temporary house. From this hole a layer of sand and clay was extracted. To test to see if this soil already contained the proper percentage of sand and clay, the shake test was done. This picture below shows the shake test (hard to see distinct layers in the picture) that was later set into the cob bench. It turned out that this mixture was almost 1/3 clay and 2/3 sand. Because it was within the ideal soil composition percentage, this soil was used to make some cob batches. In addition, this soil ended up having sand added to it to make a better mixture.
