Thank you, but the link suggests it is used for the time when someone flourished, so 1826 was presumably about the time he started chair-making, but 1851 is wrong as I have his death certificate and he definitely died in 1850, which you'd think anyone who knew about him and his chair-making would know. Or perhaps they just quoted 1851 as there were no chairs from that time onwards with his name on them.
Lizzie
ps. He would have been about 41 in 1826, perhaps when he started chair-making, in 1807 he was a carpenter (as shown on a bastardy order).