http://www.airspacemag.com/history-of-flight/Oldies-and-Oddities-Blown-Away.html

A Pratt & Whitney JT15D-1 turbofan was mounted in the nose, well
ahead of the cockpit and wing. The hot airstream exited the engine core, entered
a bifurcated duct, and exhausted just outside the fuselage through slots in the
top skins of both wings. Air from the fan was directed aft by vanes in the duct
and ducted farther out through slots on the leading edges. About 70 percent of
the wingspan was bathed in the exhaust stream.

Thanks to Andrew Vanis.