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.
According to the Occupational Outlook Handbook website administered by the Bureau of Labor Statistics of the US Dept of Labor, the 2012 median salary for a nursing assistant or orderly was $24,4400 per year. I know in my area (northwest Ohio / southeastern Michigan) stna's make between $9-11/ hour.