“…A^^net heat of combustion, kJ/kg A/'^pressure difference at height z with respect to ambient static pressure, Pa Computer Services Division of NBS with a proposal concerning the design of a series of computer programs to facilitate the analysis of automatically recorded data. During the following 2 years, a system of programs called SPEED (Systematic Plotting and Evaluation of Enumerated Data) was developed and tested [1]^T his system was announced at the Ninth Annual Technical Symposium of the Association for Computing Machinery and in an article in Computer Graphics. The following paragraphs, quoted from the Computer Graphics article, indicate the need for SPEED is still valid:…”