Mining.- [Hunt (Thomas, late 18th century London-based inventor, active c. 1780-1805)]. A Perspective view of a Steam or Fire Engine for draining of mines ..., 'and Coll[?] and at the same time for raising of coal or Ore with the aid or assistance of Horses as usually practised; Invented by Thomas Hund of London, 1781 [...]', large diagram with extensive note underneath by the "inventor", with descriptive 'reference' text describing the workings of the machine, pen and brown ink with gouache, on J Whatman laid paper with Strasbourg lily watermark, two sheets joined, total 550 x 1470 mm (21 3/4 x 57 7/8 in), old vertical folds, some splitting, handling creases, surface dirt and browning, the right edge with some marginal loss, other nicks and small tears to edges, unframed, [circa 1780-1800].