Analysis of Jerusalem: I see the Four-fold Man, The Humanity in deadly sleep

I see the Four-fold Man, The Humanity in deadly sleep
     And its fallen Emanation, the Spectre and its cruel Shadow.
     I see the Past, Present and Future existing all at once
     Before me. O Divine Spirit, sustain me on thy wings,
     That I may awake Albion from his long and cold repose;
     For Bacon and Newton, sheath'd in dismal steel, their terrors hang
     Like iron scourges over Albion: reasonings like vast serpents
     Infold around my limbs, bruising my minute articulations.

I turn my eyes to the schools and universities of Europe
   And there behold the Loom of Locke, whose Woof rages dire,
   Wash'd by the Water-wheels of Newton: black the cloth
   In heavy wreaths folds over every nation: cruel works
   Of many Wheels I view, wheel without wheel, with cogs tyrannic
   Moving by compulsion each other, not as those in Eden, which,
   Wheel within wheel, in freedom revolve in harmony and peace.