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.
JAMES HARGREAVES AND THE SPINNING JENNY. The spinning wheel, which made only one thread at a time, was displaced by the spinning jenny, on which twenty, fifty, a hundred, and even a thousand threads can be spun at once. The inventor was James Hargreaves, an Englishman. Hargreaves sat pondering one day over a faster way to [91] spin cotton.