Before revision: By mid-1792 prominent Philadelphians had formed the Lehigh Coal Mine Company (LHCM Co.) to bring Anthracite to cities reachable via the Delaware River Valley, especially Philadelphia — the nation's largest and most industrialized city , though no one fully understood how to use anthracite as a sole fuel—just that it 'could' burn 'some' of the time with a hot enough base fire, so could augment furnace fuels.
After revision: By mid-1792 prominent Philadelphians had formed the Lehigh Coal Mine Company (LHCM Co.) to bring anthracite to cities reachable via the Delaware River Valley, especially Philadelphia ,at the time the nation's largest and most industrialized city , though no one fully understood how to use anthracite as a sole fuel—just that it 'could' burn 'some' of the time with a hot enough base fire, so could augment furnace fuels.