Bomb dropping sounds used in many films from 40' - 80's (Cinesound)
So Blithe Spirit was on TV earlier in the background. At the end of the film, I was most surprised to hear this bomb dropping sound in the clear!. This'll be in the next update which'll obsolete the older recordings.
This classic bomb dropping sound was used in just about every classic war film from the 60's. I wouldn't be at all surprised if the underlying basis of the sound was sourced from a firework. The key to identifying this one is by listening right towards the end of it. Listen closely and you can hear a distinct hiss of somekind.
Used in:
Blithe Spirit - 1945
Run Silent Run Deep - 1958
Day Of The Triffids trailer - 1962 (http://www.youtube.com/watch?v=1eCmqWDx5A4
Strange Report - (Let Sleeping Heroes Lie) - 1969
The Battle Of Britain - 1969
36 Hours of Hell - 1969
The Battle of Sutjeska - 1973
A Bridge Too Far - 1977
For Your Eyes Only - 1981
Land Of The Lion - 1981
Time Bandits - 1981
Savage Islands - 1983
Terrahawks - The Midas Touch - 1984
Terrahawks - Christmas Miracle - 1984
Terrahawks - Cry UFO - 1986
Terrahawks - Space Cyclops - 1986
Sky Bandits - 1986
My Cinesound Effects Library preservation project can be found at the Fanderson forums:
http://www.fanderson.org.uk/forum/showthread.php?t=303
If you've heard this sound in other films, by all means add it to the comments and I'll update the listing.