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The spinning jenny was superseded by the spinning mule. The jenny was adapted for the process of slubbing, being the basis of the Slubbing Billy. Origin and myth. The most common story told about the invention of the device and the origin of the Jenny in the machine's name is that a