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.
1 Average salary: $52,500 P/A. * 2  Wages will vary according to your level of skill, experience and employer. 3  Employment level: 46,100 as of November 2012 (Projected employment levels in 2017 of 51,900). 4  Average weekly hours: Average weekly hours worked for a full time Construction Worker is 40.2 hours. Average salary: $52,500 P/A. * 2  Wages will vary according to your level of skill, experience and employer. 3  Employment level: 46,100 as of November 2012 (Projected employment levels in 2017 of 51,900). 4  Average weekly hours: Average weekly hours worked for a full time Construction Worker is 40.2 hours.