The six periods of sin-induced catastrophe on the earth are punctuated by six covenants which are part of God’s salvage-operation: through Noah, through Abraham, through Moses, through Joshua, through David, and through Jesus. Each covenant is an agreement by means of which a faithful remnant is defined by its commitment to Higher Truth and sets itself apart from the world, so that it may not only be spared the second death in the lake of fire, but be re-admitted to Paradise and access to the Tree of Life (Revelation 20:11-15). In each case in the Biblical account the spiritual movement towards God is symbolised by a geographical movement, and each covenant is sealed by the blood of sacrifice.
Robert Bowyer (d.1834) expanded his copy of the Macklin Bible by inserting over 6200 prints. The Bowyer Bible is housed in Bolton Museum. For the prints, see https://archive.org/details/bowyer-bible For Phillip Medhurst’s interpretation of the Revelation, see https://archive.org/details/The_Apocalypse_Revealed