Chicago : Engineering and Contracting Pub. Co. · leaf 274
Fig. 13. cation filed Jan. 26, 1875, patented Nov. 28:1876. The invention relates to an iron frame havingopen chambers of considerable size adapted toreceive macadam or its equivalent, and con-sists in a subsurface grate, the transverse barsof which are constructed with roughened or in-dented heads…
Buildings
Internet Archive · University of Illinois Urbana-Champaign · Public Domain Mark 1.0. Free to use for anything.
