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.
The Spinning Jennyâs limitation was that the thread it produced was coarse and lacked a certain degree of strength, making it suitable only for the weft, the threads woven across the warp. In 1770 Hargreaves patented his Spinning Jenny. You can view the Patent for the Spinning Jenny, it is in the British Library Collection. And it was called a Spinning Jenny because James Hargreaves named his invention after his wife.