Pressed and aged notches were employed to large tension specimens for propagation tests of brittle crack. Shapes and conditions of specimens which were determined by several preliminary tests showed excellent ability for crack initiation. Following the similar method to the ESSO test, only one-tenth of impact energy was required in this test to initiate the brittle crack, as compared to the one necessitated in the ESSO test and the condition of crack initiation was insured even at lower stress level or at higher temperature range in spite of very low impact energy. Only by applying the impact without any tensile stress, the brittle crack could initiate and propagate, so the propagation characteristics of target steels could be estimated by wedge impact test on smaller specimens. The specimens with no impact showed crack initiation at about two-thirds of stress level of yielding stress.