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An inexpensive, easy-to-use analog computer has been designed and built that provides real-time analog signals proportional to combustion heat release, rate of heat release, and other related parameters in operating engines. This paper describes the computer and provides examples of engine data obtained with the computer.

A STUDY has revealed that few truck cabs are designed with the comfort of the driver in mind. All too often, cabs were found to be far below the minimum standard in dimension, equipment, ease of operation, adjustability, and visibility. This situation interferes with the efficiency of the driver, causing at various times inconvenience and discomfort which eventually has an effect on the safety of operation. This paper reports the findings of this study and suggests criteria for a more efficient and comfortable cab. The study was undertaken at the Harvard School of Public Health.*