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.
In addition, the median hourly wage and median annual salary is around $9.35 per hour and $19,440 per annum respectively. The lowest paid 10 percent of nail technicians earned an hourly wage of less than $7.85 per hour, whereas the top 10 percent of them received more than $14.71 per hour.n addition, the median hourly wage and median annual salary is around $9.35 per hour and $19,440 per annum respectively. The lowest paid 10 percent of nail technicians earned an hourly wage of less than $7.85 per hour, whereas the top 10 percent of them received more than $14.71 per hour.