John & James Dobson Carpet Mill (West Parcel), Building No. 25, 4041-4055 Ridge Avenue, Philadelphia, Philadelphia County, PA

Significance: Built in 1874-75, Building 25 was one of the first structures, following the water tower of Building 1, to be constructed with brick segmental arches over the windows. The later additions to the building are a good document of the incremental expansion used by the Dobsons to enlarge their facilities. The building's less prominent location on the site and simple construction indicate its use as a secondary building in the line of textile production.
Survey number: HABS PA-5383-V
Building/structure dates: 1875 Initial Construction
Building/structure dates: 1890 Subsequent Work