Iron in Ancient India c7.s2.4

c7.s2.4

Hadfield has also determined the Fremont shock test, the Brinell ball test for hardness, as well as scleroscope hardness of the specimens of Ceylonese iron. His conclusions are summarized thus: "The Fremont shock tests show fair results on the specimen taken from the chisel, namely 17 kilogrammes, with 85° bend. The other specimens, however, show much lower figures, namely the nail (1 kilogramme by only 1° bend) and the bill-hook (7 kilogrammes by 35° bend). The hardness by the Brinell method varied from 117 to 166, one result from the nail showing 209; but this is abnormal, and cannot be accepted as representative. The scleroscope tests varied from 25 to 44, and as a comparison it may be mentioned that water-quenched carbon steel by this latter method shows 100 and ordinary wrought iron about 20."