The T2313 unit has a central baffled coil.
The T2312 unit possesses a containment coil at its center.
Both scratchbuilt scenery pieces measure approximately 4 inches (100 mm) long. They are scaled for use with 25 to 28mm miniatures such as the scientist figure shown in the pictures. The pieces could be used in a range of role-playing and wargame settings from modern super hero, pulp, and future science fiction.
You can see more of my miniature terrain and scenery pieces at my store.