Process for the dosage of the exposure during the copying of positive lineoriginals on diazotype material

Claim 1

A PROCESS FOR THE DOSAGE OF EXPOSURE DURING THE TRANSMISSION-COPYING OF A POSITIVE LINE ORIGINAL ON DIAZOTYPE MATERIAL WHICH COMPRISES EXPOSING THE MATERIAL TO LIGHT TRANSMITTED THROUGH THE ORIGINAL, SAID LIGHT HAVING A WAVE LENGTH THAT IS TRANSSMITTED IN PROGRESSIVELY INCREASING INTENSITY BY SAID MATERIAL AS THE PHOTOLYSIS OF THE DIAZO COMPOUND IN SAID MATERIAL PROCEEDS, IMPINGING THE QUANTITY OF SAID WAVE LENGTH WHICH IS TRANSMITTED BY THE ORIGINAL AND SAID MATERIAL DURING THE COPYING OPRATION UPON A PHOTOELECTRIC CELL HAVING ELECTRIC ENERGY INTEGRATING MEANS CONNECTED THEREWITH, SAID QUANTITY BEING SUBSTANTIALLY INDEPENDENT OF THE LIGHT TRANSMISSION CHARCTERISTICS OF THE ORIGINAL, AND TERMINATING THE EXPOSURE UPON AND IN RESPONSE TO THE QUANTITY OF ELECTRIC ENERGY RECEIVED FROM SAID CELL BY SAID INTEGRATING MEANS REACHING A PREDETERMINED VALUE.