5663. Stewart, A., and White, F. W. Sept. 2. Percussive hand tools. -In a portable scaling- hammer in which the scaling-tool b is carried by a piston or plunger a which is raised by means of a cam g against the resistance of a spring f coiled round the lower end of the plunger stem c', the cam g is arranged at one side of the axis of the plunger and engages a pin j in the forked rear end d of the plunger. stem c' which is guided by a pin e. Specification 22,162/08, [Class 61, Hand tools &c.], is referred to.