The Internet Archive has a preservation copy of this work in our general collections.
the names and locations of which were withheld by request of the plant owners. For the purpose of identi fication the plants were referred to by letters of the alphabet. The essential features of the reports are given as foliows by Power: Two pressure producers with generators 7 feet in inside diameter, wet scrubbers 772 feet inside diameter and 18 feet high and dry scrubbers 7 feet square by 3�� feet high. The producers use bituminous coal, costing $2 . .55 per ton; two tar extractors aredoi:10.1038/scientificamerican11251911-342supp fatcat:vfpxwrliw5d45gviixb3jz4cbu