In an early, simple hay tedder described in 1852 and manufactured in Edinburgh by the company of Mr. Slight, the two wheels, via a spur wheel and a pinion, drive a set of light wheels, the rake wheels; on these two rake wheels are mounted eight rakes, which pick up and disperse the hay.
It should be noted, how-ever, that only about 1 out of every 10 STEM workers has a high school diploma or less. Those with gradu-ate degrees in a STEM job earned more than $40 per hour, nearly $4.50 more per hour on average than those with non-STEM jobs.
The U.S. Bureau of Labor Statistics reported the average hourly wages for different types of science technicians in 2008. Forensic science technicians earned a median hourly wage of $23.97. Based on a 40-hour work week and 52 weeks a year, this translates to a median monthly salary of $4,154.75, or $49,857 a year.