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.
Work Settings and Special Qualifications. The College of DuPage reports that SPLA hourly wage rates range from $22 to $25 per hour in settings such as schools or private practice. In an early intervention setting, however, where the focus is on home visits, a typical hourly wage is $32 to $45 an hour. SPLAs allow the speech and language pathologist to provide services to more people and to focus on tasks that require a higher level of education and experience.