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.
Comparison with employment unit. The 2014 full-time average hourly wage rate for natural and applied sciences and related occupations, which includes chemical engineers, is $34.65. The 2014 corresponding median weekly wage rate is $1275, giving an approximate full-time annual salary for this employment unit of $66,000.he Canadian national occupation classification code (NOC) for this role is 2134. Job titles and exact duties vary in this occupation and examples of some job titles are: chemical engineer, biochemical engineer, petrochemical engineer, electrochemical engineer and polymer engineer.