Adjustment of recording devices

Claim 1

IN A RECORDING DEVICE, A PRESSURE SENSITIVE CHART, A PANEL IN FRONT OF SAID CHART HAVING AN OPENING FORMING A WINDOW FOR AT LEAST PART OF SAID CHART, MEANS FOR DRIVING SAID CHART, CONDUCTIVE PERCUSSION MEANS ARRANGED FACING SAID CHART, A GALVANOMETRICALLY CONTROLLED STYLUS SUPPORTED ON THE BACK OF SAID PANEL AND MOVABLE ACROSS SAID WINDOW IN A PLANE EXTENDING BETWEEN SAID PERCUSSION MEANS AND SAID CHART, AND ALSO ARRANGED TO BE MOVABLE BY SAID PERCUSSION MEANS IN A DIRECTION PERPENDICULAR TO SAID PLANE TO CONTACT SAID CHART AT AN INTERSECTION BETWEEN SAID PERCUSSION MEANS AND SAID STYLUS, THEREBY PRODUCING ON SAID CHART, A RECORDING MARK CORRESPONDING TO THE INSTANTANEOUS POSITION OF SAID STYLUS WITH RESPECT TO SAID PERCUSSION MEANS, AT LEAST ONE CONTROL ELEMENT CONSISTING OF A SUBSTANTIALLY TRIANGULAR PLATE MOUNTED ROTATABLY ON A CORNER THEREOF AND HAVING A CONTACT EDGE FORMED ON THE BASE FACING SAID CORNER; SAID CONTACT EDGE ENGAGING THE LATTER WHEN SAID STYLUS IS ENGAGED BY SAID PERCUSSION MEANS, SAID CONTROL ELEMENT BEING SUPPORTED TOGETHER WITH SAID PERCUSSION MEANS ON SAID PANEL BACK, AND ARRANGED IN THE SPACE BETWEEN STYLUS AND SAID CHART, AND MOVABLE FROM THE FRONT OF SAID PANEL IN A PLANE SUBSTANTIALLY PARALLEL TO THAT OF SAID STYLUS MOVEMENT SO AS TO CAUSE SAID PERCUSSION MEANS WHEN ENGAGING SAID STYLUS TO SIMULTANEOUSLY ENGAGE SAID CONTROL ELEMENT AND RELAY MEANS COUPLED TO SAID PERCUSSION MEANS, AND TO OPERATE SAID CONTROL ELEMENT BY THE SIMULTANEOUS ENGAGEMENT OF SAID STYLUS AND SAID PERCUSSION MEANS.