[franju]

Wartime photoshttp://www.luftwaffephotos.com/

[GT_Yellowjacket]

That is not a solid bar,but rather the two panes of glass meeting point.The front pane slid backward so the whole canopy did not have to be opened for the pilot to recieve papers etc.If you ever notice a right side view does not have the sliding pane,hence no bar.