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.
They earn a median salary of $78,860 annually, with a range of $49,480 to $123,270. This translates to $37.92 per hour, with a range of $23.79 to $59.27. The biggest employers of biomedical engineers are manufacturers of medical equipment and supplies, with 23 percent of the available 14,760 positions.