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.
With starting salaries of $33,660 and experienced salaries of $80,506, professionals in this industry average $56,634 per year ($27.20 per hour). That's an impressive $10,614 more than the typical pay of $46,020 ($22.10 per hour) across industries nationwide.