Seeking ID of strange "cheese grater" device on below cockpit window of some 1940 He111s

[ChrisS]

Thank you very much David for putting things straight!! The Grainger illustration matches the photograph and therefore, as you say, must be the box connected with the forward MG. The photograph however is not of the Hendon example but is a wartime original. It would be superb to see your photos of the Hendon example published. Am I correct in saying that the aircraft is essentially unrestored and in an original internal condition? Other than the Bf 109 G-2, I believe it's true that all the Hendon Luftwaffe aircraft are in this condition??

Thanks also for the information on the chute cover. Subsequently I've found two other shots with this cover in place, your explanation has made sense of these photos.

Cheers!
Chris