The theoretical blueprints can be found on the wall near the Drafting bench in Howl's Workshop area of the Stormguard Citadel. Level 95 Archaeology[B] and a restored Stormguard gerege are required to gain entrance to the workshop via the Gravitational core.
The study option initially present on the theoretical blueprints allows the discovery of the Howling Man special research. It requires level 118 Archaeology to be completed.
After having studied the theoretical blueprints, they are also used to discover the blueprints required to create 2 relics and 1 relic component. This discovery process requires completion of the Back to the Drawing Board special research. This will also require the Invention skill to be unlocked.