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 Bureau of Labor Statistics (BLS) in 2015, CNAs earned an average hourly rate of $12.36 per hour and made $25,710 a year. The lower spectrum of the salary range reported that less than 10% earned $9.32 an hour and about $19,390 annually, while the top 10% enjoyed $17.74 hourly and $36,890 per year.