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(A) Floor of group space, sunk four feet below the level of hall floor to permit of various elevations of foregroup in group. (B) Floor of gallery group case. (E) Glass roof of gallery group case. (F) Glass roof of main floor group case.

(G) Glass in front of gallery case set at angle to cut reflections. (H) Glass in main floor case. (I) Space occupied by bronze panels. (J) Space above gallery groups for artificial lighting purposes. (L) Plane of painted background.