Show iron when does iron shrink hrin andwan and does it in cooling whenever ae vei make a pattern tor for I 1 iron ron it must bu be 1 pr per cent larger than ihan the casting we expect to get Is aiom oil it and the casting will be about tout that much bealler t ban chii mold it itis is formel in ht this indicates that iron contracts in cooling on tho hand it we a piece ot of solid iron into a ladle of 0 molten detal 0 of exactly erectly the same kind it V will III not only float but will rise perhaps 10 per cent above abort the surface tur face and if i it 11 be forcibly jcu ini mersed it will buoyantly rise again this indicates that iron expands in cooling but when does it stop expanding aud and begin to shrink this question H hen bell it ji Is settled will lie still but meanwhile there is it a mighty iiii asty fut cresting discussion ja ill it says bays the industrial world |