is a standard volume dial index a volume driven gear train 18 is mounted to a back wall 20 of the recorder case 16 the gear train 18 includes a basic gear reduction box well known in the art a drive shaft 22 extends into the gear train 18 through the volume meter 14 from the fluid stream in the conduit 12 the fluid flow in the conduit 12 rotates the drive shaft 22 which in turn rotates the driven or output shaft 24 via the gear train 18 the apparatus uses a turbine in the pipeline to rotate the drive shaft the turbine pressure seals packing glands and cooperative apparatus are omitted for sake of clarity in focusing attention on the inventive volume based recorder disclosed herein the recorder case 16 is a box like structure including a top wall 26 a bottom wall 28 and the back wall 20 the recorder case 16 also includes a chart catcher and a door likewise omitted to focus on the volume dependent chart recorder the recorder case 16 is secured to the volume meter 14 by bolts 30 extending through the bottom wall 28 as shown in fig1 the back wall 20 includes a hole 21 for receiving the driven shaft 24 therethrough a pen arm support assembly 32 is mounted adjacent the top wall 26 on.