Raw Materials. The main component of brass is copper. The amount of copper varies between 55% and 95% by weight depending on the type of brass and its intended use. Brasses containing a high percentage of copper are made from electrically refined copper that is at least 99.3% pure to minimize the amount of other materials.
Principal Scientist in Boston, Massachusetts Salary. A Principal Scientist in Boston, Massachusetts earns an average salary of $123,925 per year.
Earn Less Than Medical Scientists. While clinical research associates earned starting salaries of $62,000 in 2014, the BLS reported average annual salaries of $87,830 for medical scientists as of May 2012. The top 10 percent made more than $146,650.