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 average wage of workers in the occupation was $30.25 an hour. Workers in the top 10 percent in terms of annual income made more than $94,180, and workers in the bottom 10 percent earned less than $36,850. Fifty percent of construction foremen had annual incomes between $46,080 and $75,490.