1. IN A DRILLING WEIGHT RECORDER: CHART MEANS INCLUDING A REMOVABLE CHART; TIME CLOCK MEANS CONNECTED TO ADVANCE SAID CHART AT A UNIFORM RATE LENGTHWISE OF SAID CHART; FLUID PRESSURE RESPONSIVE MEANS IN SAID RECORDER ADAPTED TO BE CONNECTED TO A FLUID PRESSURE TRANSMITTING SOURCE INTERPOSED IN THE DRILL BLOCK SUPPORT, SAID PRESSURE RESPONSIVE MEANS INCLUDING A CYLINDER HAVING A CUP-LIKE PRESSURE SENSITIVE BELLOWS THEREIN, AND A BELLOWS FOLLOWER CONFINED TO LINEAR MOVEMENT IN SAID CYLINDER; A STYLUS ARM PIVOTALLY MOUNTED FOR MOVEMENT LATERALLY ACROSS AND PERPENDICULARLY OF SAID CHART AND HAVING LONGTUDINALLY SPACED CONNECTING LINKAGE POINTS THEREON; AND LINKAGE MEANS INTERCONNECTING A SELECTED ONE OF SAID LINKAGE POINTS OF SAID STYLUS ARM AND SAID BELLOWS FOLLOWER, SAID LINKAGE MEANS INCLUDING A UNIVERSAL JOINT WHICH ACCOM-