What is the niello technique?

Is this statement true or false? before 1850, workers in american mines, mills, and factories were poorly paid, but their safety on the job was always protected by strict laws.

Carefully examine this photograph of a home bomb shelter. fearing a nuclear attack, many people put these in their homes during the 1950s. describe what you see in the image. what kinds of things did this homeowner think to include?

Dams are used for all of the following purposes except