Hi Airmann,
Count the windows.
Commet and Caravelle had 4 windows each side visible (I think the centre window is visible in your Commet picture), but they were all flat plates and quite small.
As the window design improved, they get bigger (hence fewer) and more curved. In order to improve the forward visibility, they are angled inwards at the bottom. Until B787 design where the windows are so huge (only two each side) and curved they can fit the nose profile perfectly.
Last edited by rudderrudderrat; 16th Sep 2013 at 12:41.