. Automotive industries . block E is of steel and is insulated from C, on whichit is supported by a layer of Bakelite cement No. the block E extends a No. 16 copper wire withtriple braid weather-proof insulation, through a iron pipe. Evidently when Block E is in me-tallic contact with disk B an electric circuit is closedthrough the ground. The soil pressure tends to closethis circuit, and by admitting compressed air through. Fig. 12—Diaphragm cell for determining soilpressure Fig. 13—Apparatus for reading pressure on soilpressure cells the iron pipe until the circuit is
. Automotive industries . block E is of steel and is insulated from C, on whichit is supported by a layer of Bakelite cement No. the block E extends a No. 16 copper wire withtriple braid weather-proof insulation, through a iron pipe. Evidently when Block E is in me-tallic contact with disk B an electric circuit is closedthrough the ground. The soil pressure tends to closethis circuit, and by admitting compressed air through. Fig. 12—Diaphragm cell for determining soilpressure Fig. 13—Apparatus for reading pressure on soilpressure cells the iron pipe until the circuit is broken and then meas-uring the air pressure, the soil pressure per square inchis directly determined. Distribution of Subgrade Pressure Fig. 13 shows the measuring box and connection forreading the soil pressure cell. In Fig. 14 a cross sectionof the Camp Humphreys Road is shown, the location ofthe four cells used in making this test being road had an 8-in. concrete slab of great strength,which naturally has the effect of distributing the con-centrated wheel load over an extended area of spite of this fact, the maximum subgrade pressureunder the wheel was greater than certain kinds of sub-grades will support when water soaked. It is perfectly April 28, lJl AUTOMOTIVE INDUSTRIESTHE AUTOMOBILE 903
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectaeronautics, bookyear
