This topic is covered in Lace Machines and Machine Laces by Pat Earnshaw, p. 66 and p. 67. This claims that John Heathcoat was born in 1783 (not 1732!) and died in 1861. The first warp frame making marketable net, which resembled knitting, was made in 1795 when Heathcoat was 12. He seems to have registered some variation on the warp frame in 1804 (when he was 21). Then he started studying the movements of the Northamptonshire bobbin lacemakers and invented the machine that copied point ground in 1808. So, I would say that this is entirely consistent with our discussion of point ground. Devon
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