Vernois

Claim 1

A MULTICURVE GRAPHIC RECORDER COMPRISING MEANS FOR FEEDING AN ELONGATED RECORD MEDIUM IN A LONGITUDINAL DIRECTION, AT LEAST TWO MECHANICAL RECORDING ELEMENTS EACH MOUNTED FOR DISPLACEMENT ACROSS THE ENTIRE WIDTH OF SAID MEDIUM TO RECORD RESPECTIVE CURVES THEREON, SAID RECORDING ELEMENTS BEING DISPLACED RELATIVE TO EACH OTHER IN THE LONGITUDINAL DIRECTION OF SAID MEDIUM, A FIRST PHOTOELECTRICALLY OPERATED MECHANISM RESPONSIVE TO VARIATIONS IN THE POSITION OF A MOBILE LUMINOUS SIGNAL AS A FUNCTION OF A FIRST VARIABLE MAGNITUDE TO BE RECORDED FOR IMPARTING TO ONE OF SAID RECORDER ELEMENTS CORRESPONDING DISPLACEMENTS ACROSS SAID MEDIUM, AT LEAST ANOTHER PHOTOELECTRICALLY OPERATED MECHANISM RESPONSIVE TO THE VARIATIONS IN THE POSITION OF A MOBILE LUMINOUS SIGNAL AS A FUNCTION OF A SECOND VARIABLE MAGNITUDE TO BE RECORDED CONCURRENTLY WITH SAID FIRST MAGNITUDE, FOR IMPARTING TO ANOTHER OF SAID RECORDING ELEMENTS CORRESPONDING DISPLACEMENTS ACROSS SAID MEDIUM, AND A PHOSPHOROGRAPHIC DELAY DEVICE INTERPOSED BETWEEN THE MOBILE LUMINOUS SIGNAL WHICH IS A FUNCTION OF SAID SECOND VARIABLE MAGNITUDE AND SAID OTHER PHOTOELECTRICALLY OPERATED MECHANISM, SAID DELAY DEVICE INTRODUCING A DELAY THAT IS SUBSTANTIALLY EQUAL TO THE TIME REQUIRED FOR THE MEDIUM TO PROGRESS FROM THE POSITION OF SAID FIRST RECORDING ELEMENT TO THE POSITION OF SAID OTHER RECORDING ELEMENT SO THAT, AT ANY POINT ALONG THE MEDIUM, THE LATERAL POSITIONS OF THE CURVES RECORDED THEREON BY SAID RECORDING ELEMENTS WILL REPRESENT THE RESPECTIVE VARIABLE MAGNITUDES AT THE SAME POINT IN TIME.