Fixed Anvil Assembly, (Fig. 1(A)) c

Fixed Anvil Assembly, (Fig. 1(A)) consisting of an
effectively rigid anvil having a minimum mass of 170 kg and
providing a flat, rigid surface for specimen support. The
specimen support surface shall be planar, normal to the vertical
direction of missile travel, centered under the tup of the
gravity-driven assembly and of sufficient area to support the
entire lower surface of the specimen.