The Boulton and Paul P.64 mail-carrier : a two-engine all-metal biplane (1932)
NASA Technical Reports Server (NTRS) · leaf 15
Figs.9,10 N.A.O.A. Aircraft Circular No.177 … Figure 10.- The Handley Page slots; rack-and^inion gear and a torque tube ensure even opening, and when the slot is closed there are no unsightly brackets projecting fron the wing. CFrom"Fhshro
NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
