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THE increasing demand for lighter diesel engines by the U. S. Navy and by long-distance truckers is spotlighting aluminum as essential for major diesel-engine castings, Mr. Jardine states. In practically every division of transportation, he continues, the light-weight power unit is becoming more important, and some of the new highway laws make the use of weight-saving aluminum a necessity. The author theoretically dismantles a conventional light-weight, high-output diesel built by the National Supply Co. Unit by unit, he shows how aluminum has been substituted for iron and steel, and gives specific reasons for each substitution. Parts thus covered are: crankcase and cylinder block, cylinder sleeves, pistons, bearings, cylinder heads, valve seats, camshaft gears, flywheel housing, and gear cover. This particular aluminum-and-steel engine, Mr.

THE post-war car will have about the same general appearance as the pre-war car, but it will be better streamlined, more efficient, and lighter. Although it will be smaller, it will be long enough to ride well and wide enough to carry three people in the front seat. Performance will be almost as good as that of present-day cars, and gasoline economy will be better. Price will be lower than that of the 1942 models. The foregoing is a brief composite picture of the post-war car as envisioned by a majority of passenger-car engineers queried by Mr. Jardine. These opinions were sent to the author in answer to a questionnaire sent out to a number of engineers who will have most to do with design of the post-war car. Excerpts from a number of these opinions are quoted in this paper. Discussing the effect of the length of the war and of inventories, Mr.