Photographic element having increased speed and contrast

Claim 1

A LIGHT-SENSITIVE PHOTOGRAPHIC ELEMENT OF IMPROVED SPEED AND CONTRAST, COMPRISING A TRANSPARENT SUPPORT AND IN SUPERPOSED, CONTACTING RELATIONSHIP IN OUTER PANCHROMATICALLY-SENSITIZED SILVER HALIDE EMULSION LAYER (I) WHEREIN THE SIVLER HALIDE IS (A) SELECTED FROM THE CLASS CONSISTING OF SILVER CHLOROBROMIDE CONTAINING AT LEAST 50 MOLE PERCENT SILVER BROMIDE AND SILVER BROMOIODIDE, AND IS (B) CAPABLE OF PRODUCING A VISIBLE IMAGE UPON EXPOSURE AND DEVEOPMENT IN A SILVER HALIDE DEVELOPER, AND BENEATH SAID LAYER (I) A NON-OPTICALLY SENTITIZED, SUBSTANTIALLY LIGHT-INSENSITIVE, FINE-GRAINED SILVER HALIDE EMULSION LAYER (II) WHEREIN AT LEAST 70 MOLE PERCENT OF THE SILVER HALIDE IS (C) SILVER CHLORIDE AND IS (D) OF SUFFICIENTLY LOW SPEED SO THAT NO VISIBLE IMAGE IS PRODUCED WHEN SEPARAETLY EXPOSED ON A SEPARATE SUPPORT TO RADIATION PRODUCING AN EMULSION UPON PHTOGRAPHIC DEVELOPMENT, SAID NONOPTICALLY SENSITIZED, SUBSTNATIALLY LIGHT-INSENSITIVE SILVER HALIDE EMULSION LAYER BEING CLOSER TO SAID SUPPORT THAN SAID PANCHROMATICALLY-SENSITIZED SILVER HALIDE EMULSION LAYER, THE RELATIVE SPEED OF SAID SILVER HALIDE EMULSION LAYER (II) BETWEEN ABOUT 0.03 AND 0.2., AND THE RELATIVE SPEED OF SAID SILVER HALIDE EMULSION LAYER (I) BEING FROM ABOUT 100 TO 3333 TIMES THAT OF SAID SILVER HALIDE EMULSION LAYER (II).