N.A.C.A, Technical Note No, 497 it 4 m i … Unfaired lamp on lower surface at 10 percent chord position. Faired lamp on lower surface at 10 percent chord position. Figure 3.- Photographs of lamp installations in the leading edge and on the lower surface of the airfoil at the 10 percent chord position.
NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.