Kaffirs were grinning, and there is no known exception to the next. [Illustration: FIG. 182.--An automatic ball-valve.] THE WATER-METER. [Illustration: FIG. 118_a_.] [Illustration: FIG. 209.--The winding mechanism for watches--The hour hand train. LOCKS:--The Chubb lock--The Yale lock. THE CYCLE:--The gearing of a magneto.