Chicago : Engineering and Contracting Pub. Co. · leaf 444
ay 15, 1872, were described. In ed of a 6-in. foundation consisting of onepart lime to five or six parts of ballast, of% to 94 in mastic asphalt cushion on which3 ins. wide, 6 ins. deep and 9 ins. longBaltic fir blocks were laid in trans-verse courses with the grain of the wood up-wards. The 9/10… … Fig. 1—Sketch Showing Method of Laying Pavement Under a Patent of 1872. is issue descriptions are given of a few ofe patents granted since that date. Al-ough numerous patents were obtained ine period from 1870 to 1880 very few of thestems seem to have been given any ex-nded trial in this country.…
Buildings
Internet Archive · University of Illinois Urbana-Champaign · Public Domain Mark 1.0. Free to use for anything.
