. Automotive industries . tted or adapted to the ordinary cast iron pistonby cutting this off above the wrist pin and applying thealuminum upper portion. The aim in pistons of thistype is to use aluminum, which has the quality of highconductivity, for the parts exposed to heat. The castiron skirt acts as a seal and guide, and because of itslower expansion under heat, can be fitted more closelythan aluminum. In this case the skirt, being insulatedfrom heat transfer from the head, remains comparativelycool and consequently does not expand is a gap between the aluminum and iron
. Automotive industries . tted or adapted to the ordinary cast iron pistonby cutting this off above the wrist pin and applying thealuminum upper portion. The aim in pistons of thistype is to use aluminum, which has the quality of highconductivity, for the parts exposed to heat. The castiron skirt acts as a seal and guide, and because of itslower expansion under heat, can be fitted more closelythan aluminum. In this case the skirt, being insulatedfrom heat transfer from the head, remains comparativelycool and consequently does not expand is a gap between the aluminum and iron portion,so that differences in expansion between the aluminumand iron make no difference in the fit or shape of thepiston. This also permits of oil drainage. The bronzebushing for the wrist pin is carried in the aluminumportion of the piston, thus transmitting the explosionforces directly to the wrist pin. This piston, which is the design of O. E. Barthel,weighs approximately the same as a light-weight, semi-steel Barthel Cross-head piston. ONE thousand and forty-one motor cars were Im-ported into British India during September, 1920,and of them, 723 were consigned from the UnitedStates, and 287 from the United Kingdom. During thesix months, April to September, 1920, the number ofmotor cars imported was 7,498, as against 2,553 in thecorresponding period of the previous year. The UnitedStates recorded 5,G54; the United Kingdom, 1,902; Can-ada, 542; France, 49, and Italy, 43. Bombay imported2,775 cars; Bengal, 2,694; Madras, 908; Sind, 590, andBurma, 531. 1114 AUTOMOTIVE INDUSTRIESTHE AUTOMOBILE May 26, 192Z Lumber Used in Motor VehicleManufacture Here is an interesting and informative study of the lumber consumptionbased on 1920 production figures. The U. S. Forest Products Laboratoryprepared the statement as the result of studies made by its engineers. By Arthur Koehler* THE rapid increase in the proportion of closed carsmanufactured is an outstanding feature of theaut
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectaeronautics, bookyear
