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.
[92] One person can spin with a jenny as much yarn as twenty to a hundred can spin, using the old spinning wheel. The yarn, too, is of better quality. Besides, boys and girls between the ages of twelve and fourteen can operate it even better than grown persons.