A Cathode Ray Tube Subroutine (CRTF) is available to FORTRAN as a function that will produce a plot on the cathode ray tube. It includes provisions for setting up the grid, writing text, and plotting points using the cathode ray tube subroutine developed by Florence Ferrin of the General Electric Medium Steam Turbine Department. Forty control words are necessary in FORTRAN storage (stored sequentially) to set up grid lines, scales, labels,photograph identification, and two lines of miscellaneous text, and then to plot any number of variables stored in sequence by FORTRAN. The desired text is programmed as FORTRAN Hollerith information, and as many plots as are desired may be procured by placing the CRTF instruction in a DO loop that modifies the variables and/or the control words depending on whether a change of scales and/or text is desired. This report describes the necessary control words to set up a plot and the FORTRAN instructions necessary to use CRTF in any FORTRAN assembly.
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