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.
If you answered A-C, you're 95% of the world's population. If you answered D, you need to be a maintenance worker, and you're probably on speed dial for those who answered C. 1  On average, maintenance workers make around $16.50 per hour.2  Maintenance workers are often required to be on call for nights and weekends.f you answered A-C, you're 95% of the world's population. If you answered D, you need to be a maintenance worker, and you're probably on speed dial for those who answered C. 1  On average, maintenance workers make around $16.50 per hour. 2  Maintenance workers are often required to be on call for nights and weekends.