GYROSCOPE n. 2 definitions
, invented by M. Foucault, mounted so delicately as to render visible the rotation of the earth, through the tendency of the rotating wheel to preserve a constant plane of rotation, independently of the earth's motion.
HAMMER n. 11 definitions
met the stern legionaries [of Rome] who had been the "massive iron hammers" of the whole earth. J. H. Newman. Atmospheric hammer, a dead-stroke hammer in which the spring is formed by confined air. -- Drop hammer, Face hammer, etc. See under Drop, Face, etc. -- Hammer fish. See Hammerhead. -- Hammer hardening, the…