Figs.6,7 I 8 N.A.C.A. Aircraft Circular No. 33 … Fig.7 Poite riveted duralumin with 2 flap fuel tank. Upper left,Top and valves; 9, bottom jointsisheet of varnish- Cocks '4-turn ed paper between the end and an with 4 branch- exterior reinforcing strip of es ;10,Fuel duralumin. Upper right, Attach- tanks;11,Cross ment of cocks,necks,outlets,etc:…
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