Oscillographic recorder

Claim 1

APPARATUS FOR SIMULTANEOUSLY RECORDING A VARIABLE AMPLITUDE AND A VARIABLE DENSITY REPRESENTATION OF A VARIABLE VOLTAGE ON A SINGLE MOVING PHOTO-SENSITIVE RECORD MEMBER, COMPRISING A MIRROR GALVANOMETER WHOSE MIRROR POSITION IS OSCILLATABLE ABOUT AN AXIS PROPORTIONALLY TO THE AMPLITUDE OF A VARIABLE VOLTAGE SUPPLIED TO THE GALVANOMETER, FIRST AND SECOND SUBSTANTIALLY LINE-SOURCES OF LIGHT SUBSTANTIALLY PERPENDICULAR AND SPACED WITH RESPECT TO EACH OTHER AND BOTH OPERABLE TO DIRECT LIGHT RAYS ONTO SAID MIRROR, FIRST MEANS POSITIONED BETWEEN THE MIRROR AND THE RECORD MEMBER FOR FORMING THE LIGHT RAYS WHICH REACH IT INTO A FIRST BUNDLE OF LIGHT RAYS DIRECTED TOWARD THE RECORD MEMBER, SAID MIRROR AND THE FIRST ONE OF SAID LIGHT SOURCES BEING POSITIONED SUCH AS TO REFLECT PORTIONS OF THE LIGHT RAYS FROM SAID FIRST SOURCE WHICH STRIKE IT ONTO SAID FIRST MEANS AND THEREFORE TOWARD THE RECORD MEMBER, SUCH PORTIONS BEING VARIABLE WITH THE INSTANTANEOUS POSITION OF THE MIRROR, SECOND MEANS POSITIONED BETWEEN THE MIRROR AND THE RECORD MEMBER FOR FORMING LIGHT RAYS WHICH REACH IT INTO A SECOND BUNDLE OF LIGHT RAYS DIRECTED TOWARD THE RECORD MEMBER, SAID SECOND MEANS BEING SO POSITIONED WITH RESPECT TO THE SECOND LIGHT SOURCE AND THE MIRROR AS TO RECEIVE RAYS REFLECTED BY THE MIRROR FROM THE SECOND SOURCE, AND THIRD MEANS POSITIONED BETWEEN THE RECORD MEMBER AND SAID FIRST AND SECOND MEANS FOR FORMING SAID FIRST BUNDLE OF LIGHT RAYS INTO A SUBSTANTIALLY LINE IMAGE ON THE RECORD MEMBER AND EXTENDING GENERALLY PERPENDICULAR TO THE DIRECTION OF MOVEMENT THEREOF AND FOR SIMULTANEOUSLY FORMING SAID SECOND BUNDLE OF LIGHT RAYS INTO A SUBSTANTIALLY SPOT IMAGE ON THE RECORD MEMBER.