. Automotive industries . mphreys concreteroad to determine the maximum soil pressure underthe rear wheels of a Class B army truck, which carrya weight of 8500 lb. each. Recently similar tests weremade with a 5-ton, 6-wheel truck, in which the loadof the truck is distributed over four instead of twowheels. Sectional and plan views of the diaphragmcell for determining soil pressure are shown in The cell consists of three cast iron disks A, B, C,and a malleable iron ring D, A and B and D and Cbeing secured together respectively by means of ma-chine screws. The top is covered with a brass
. Automotive industries . mphreys concreteroad to determine the maximum soil pressure underthe rear wheels of a Class B army truck, which carrya weight of 8500 lb. each. Recently similar tests weremade with a 5-ton, 6-wheel truck, in which the loadof the truck is distributed over four instead of twowheels. Sectional and plan views of the diaphragmcell for determining soil pressure are shown in The cell consists of three cast iron disks A, B, C,and a malleable iron ring D, A and B and D and Cbeing secured together respectively by means of ma-chine screws. The top is covered with a brass dia-phragm in. thick, pressed over the sides andcemented, to the sides only, with asphaltic cement. Thebrass top is protected by a covering of cheese cloth ce-mented to the top and sides with a blown oil brass diaphragm in. thick is clamped betweenA and B and between C and D. The clamped joints,which must withstand air pressure, are treated with aspecial compound of rubber, vaseline and beeswax. The. 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
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectaeronautics, bookyear
