1851 Great Exhibition: Official Catalogue: Class IX.: David Harkes
From Graces Guide
23. HARKES, DAVID, Mere, near Nutsford — Inventor and Manufacturer.
Plough, with the joints welded instead of being connected by bolts and screws, and improved mould-board; it can be used with or without wheels.
Parallel expanding horse-hoe, for hoeing between turnips, potatoes, etc.; it can be set to any required width by a lever fixed between the handles, without stopping the horses.
Cheese and cider press, operating on the principle of a steelyard, which can be regulated to any pressure.
Hay-cutter.
Machine for screening clay for bricks, tiles, pipes, etc.