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.
Wages for this profession averaged $31,370 a year, or $15.08 an hour, with the lowest paid 10 percent receiving less than $15,680, or $7.54 an hour. The highest paid 10 percent earned more than $51,200, or $24.61 an hour.