Current eBay listings include prices ranging from the reasonable £15 to £1,850 for a particularly rare model. A complete collection, meanwhile, is valued at the very precise £2,829.29.

The gin solved the problem inherent in marketing ... capital city of Philadelphia and to delays in preparing a working model. Although his initial design was for a hand-operated version, Whitney ...

click image for close-up In October of 1793, Eli Whitney sent a drawing of his new invention, the cotton gin, to Secretary of ... with is the forwarding a model, which being received, your patent ...