Brick making
4. Bakewell's Patent Brick Machine. Civil Engineer and Architect's Journal, May 1840, p 160 . 5. ABP-HBM-1.202 Machine Pressed Brick . 6. Civil Engineer and Architect's Journal, 23 August 1851, p 346. 7. Sketch By Sohan Mitra, inspired by diagram from Gemmell, And So We Graft From Six to Six: The Brickmakers of New South Wales, p 27