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.
That translates to an average hourly pay of $22.33. The median wage was lower at $16.87, since there are more people in the U.S. population with positions that pay below the average salary. The average salary increased 0.1 percent in 2013, up from $42,498 in 2012. The median salary in 2012 was $27,519.