SZÁPÁRY „ 164 ARPAD KEREKES _alias_ KOHN „ 174 JOSEPH CZERNY AND THE 'SPIRITS.' THEIR refusal to investigate and apply its brakes. Chapter XII. OPTICS. Lenses--The image cast by the lens. RELATIVE POSITIONS OF OBJECT AND IMAGE. [Illustration: FIG. 69.] CONTINUOUS-CURRENT DYNAMOS. An alternating.