Certified Ophthalmic Technician (COT). The Certified Ophthalmic Technician is the second core designation level confirming knowledge in 19 specific content areas specifically designed to test the certified ophthalmic assistant or program graduate who intends to advance their career in the eye care field.
The original spinning jenny used eight spindles instead of the one found on the spinning wheel. A single wheel on the spinning jenny controlled eight spindles, which created a weave using eight threads spun from a corresponding set of rovings. Later models had up to one-hundred and twenty spindles.
In Turns, Wheels Are at Different Speeds. Location of Differential In Car. How it works: Assuming the wheels do no slip and spin out of control, the following two examples of car motion describe how the differential works when the car is going forward and when it is turning. (see Limited Slip Differential section for wheel slipping).