Engineering and Contracting . 9 9 9 9 9 9 9 9 9 911 4 9 9 9 9 9 9 9 9 3 3 9 3 9 9 9trestle O 1) Oa$12,96416,U4910, 5,50812,,,40811, 7,40011,183 9,135 8,46910,401 8,677 ,18217,45010,998 .S, 9,53313,23311,26610,40013,333 7,33613, 5,776 $ and concrete brid > 3 ?< o ? % 4,910 IVi 7,861 1^ 7,000 1 7,800 1 19,50014 2,203Vi 10,850% 16,200% 8,220. 2 14,100IVa 17,426 % 15,460 1/4 854 %
Engineering and Contracting . 9 9 9 9 9 9 9 9 9 911 4 9 9 9 9 9 9 9 9 3 3 9 3 9 9 9trestle O 1) Oa$12,96416,U4910, 5,50812,,,40811, 7,40011,183 9,135 8,46910,401 8,677 ,18217,45010,998 .S, 9,53313,23311,26610,40013,333 7,33613, 5,776 $ and concrete brid > 3 ?< o ? % 4,910 IVi 7,861 1^ 7,000 1 7,800 1 19,50014 2,203Vi 10,850% 16,200% 8,220. 2 14,100IVa 17,426 % 15,460 1/4 854 % 14,200 1 1,420 % 6,580 % 8,500 1 3,400 % 4,950 \ 5,050 1^ 7,300 % ^i 12,137 1 % 2,820 1 21,420 ^4 1,529 1 85,740 % 47 1 7,135 14 ?4 5,366 1 %. 148 1 V* IVi % % ;e. =30-24 ft. Construction Views of Lake County Roads. ,2672,7005,6004,5003,1071,8601,9009,,9484,,,,1501,1003,1005,970 6825,637 1254,4491, 3,936 3, ii,4o6 ft. wide. One other section also was built in 1912. Thecounty road improvement work in 1913 and 1914 wasmostly macadam construction. In 1915, however, most ofthe work was asphalt macadam. Some details of theseroads and of those constructed in previous years are givenin Table L The later asphalt macadam roads are generallv builtwith a surface width of 20 ft. and a 9-in. surfacing. shows a typical cross-section. The pavement is laid in two courses. The first course consists of 6 in. of eitherslag or limestone broken in sizes of from 3 in. to 4 thoroughly bended with screenings by rolling. Ontop of this is placed a 3-in. layer of P^-in. to 2-in. stonewhich is rolled and then the asphalt applied at the ratethis is placed a layer of limestone screenings of the sizeknown as roofing screenings, and thoroughly rolled. Thisgenerally leaves a surplus of screenings on the road,which is eventually removed by traffic. In a few in- 12 stances there was some varia
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Keywords: ., bookcentury1900, bookdecade1900, bookpublisherchicago, bookyear19
