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.
Average Social Worker Hourly Wage in Iowa. Social Workers earn a median hourly wage of $29.22. Hourly wages typically start from $14.89 and go up to $36.94. Average Social Worker Yearly Salary in Iowa. Social Workers earn a median salary of $60,790 per year. Salaries typically start from $30,960 and go up to $76,830. Learn more about the Social Worker job market for salaries of real jobs in your area. Alternatively, see what Social Workers earn in other states.