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.
8 Average hourly earnings Difference STEM Non-STEM Dollars Percent High school diploma or less $24.82 $15.55 $9.27 59.6% Some college or associate degree $26.63 $19.02 $7.61 40.0% Bachelor's degree only $35.81 $28.27 $7.54 26.7% Graduate degree $40.69 $36.22 $4.47 12.3% Table 1.