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.
Median Hourly & Annual Data. Hourly. A Social Worker average wage is $25.25 per hour. The lowest 10% earn $15.28 per hour and those in the upper 10% earn more than $36.12 per hour.Annually. On an annual basis the median salary is $50,820. The lowest 10% earn a salary of $31,790 per year while the upper 10% earn more than $75,140 per year.edian Hourly & Annual Data. Hourly. A Social Worker average wage is $25.25 per hour. The lowest 10% earn $15.28 per hour and those in the upper 10% earn more than $36.12 per hour.