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.
They make a median $96,910 salary per year, with a range of $66,590 to $140,140. This translates to an hourly rate of $46.59, with a range of $32.01 to $67.38. Their biggest employers are architectural and engineering services, with almost 17 percent of the available 16,710 jobs.