The document discusses the process of making bricks which involves moulding, drying, and burning. Bricks are moulded by hand or machine into standard sizes prescribed by the Bureau of Indian Standards. They are then dried before being burnt in kilns at high temperatures between 700-1000°C, which causes physical and chemical changes that make the bricks strong and resistant to cracking. Good quality bricks are uniformly shaped, well-burnt, and produce a clear ringing sound when struck. They also absorb less than 20% water and have sufficient hardness and crushing strength. Bricks are classified based on their burning process as sun-dried, burnt, and overburnt.