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.uclear engineers are concerned with the use and control of nuclear energy, and the disposal of nuclear waste. They make a median $96,910 salary per year, with a range of $66,590 to $140,140.