van der laan, congrats to that steal on the barograph.... those are moments any collector cherishes.... your barograph is even nicer as it has the original rubber mountings. it would mostly have been instaled behind the pilot seat. concerning jacobs, upon his death most of his personal belongings were actualy given to the technik museum in berlin.... i am sure that they are contactable for interested researchers. cheers oli(ver)
Jasta 11 - wwi Aviation alias wulffo here