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.
These techs earned median wages of $17.76 per hour or $36,950 per year as of May 2011. For phlebotomists specifically, the industry-supported Explore Health Careers website cites a salary range of $25,177 to $30,470 per year, or $12.10 to $14.65 hourly.