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.
National Salary Data. According to the U.S. Bureau of Labor Statistics, the average hourly wage in 2012 was $62.93. The lowest-paid 10 percent earned $26.11 per hour. At the 75th percentile level, the hourly rate was $80.77.