1851 Great Exhibition: Official Catalogue: Class IX.: J. Slight
42. SLIGHT, J., 34 Leith Walk, Edinburgh — Manufacturer.
A Tweeddale subsoil trench plough; an improvement on Read's by the Marquis of Tweeddale.
The Tweeddale trench plough, invented by the same, for the purpose of taking a furrow slice fourteen inches deep as a precursor to the former.
Model of Henderson's patent derrick crane.