Rockwell hardness test: A method of measuring hardness. The hardness is expressed as a number related to the depth of the residual penetration. A test for determining the hardness of a material based on the depth of penetration of a specified penetrator in to the specimen under certain arbitrarily fixed condition of test. A hardness test where the loss in kinetic energy of a falling diamond tipped metal ‘tup’, absorbed by indentation upon impact of the tup on the metal being tested is indicated by the height of rebound.

Dip your sponge into the water, tehn turn it over and dip it again. That gets both sides wet. Now give it a squeeze to get most of the water out—but not all of it! You'll get the feel of how much water you need in your sponge as you practice with the clay.

The mighty combers crashed down with long echoing reverberations like the roar of great cannons, followed by the ominous swish of broken water rushing across the reef in mad clouds of foam and spray.

Manifold pressure exceeding the limit lines shown in figure 5-2, constitutes an overboost.