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 website iSeek.com, a partner of the Minnesota State Colleges and Universities System, building commissioning engineers earn a median hourly wage of $35.19. The average annual salary for this position is $73,195.early 250 of these participants indicated that they earned between $90,000 and $100,000 per year. Slightly fewer respondents gave their salary range between $80,000 and $90,000 per year, while roughly 200 of the 2,000 surveyed indicated their annual earnings were between $70,000 and $80,000.