BOMBA · 1938 — IMAGE CREDITS

The historical figures in this exhibit are local copies of the following
Wikimedia Commons files. Original proportions are preserved. No additional
crop, retouch or colour treatment has been applied to the article figures.

1. Enigma (crittografia) - Museo scienza e tecnologia Milano.jpg
Photograph: Alessandro Nassiri / Museo Nazionale della Scienza e della
Tecnologia Leonardo da Vinci, 2012. Commons version cropped by OS in 2016.
License: Creative Commons Attribution-ShareAlike 4.0 International
https://creativecommons.org/licenses/by-sa/4.0/
Source and file history:
https://commons.wikimedia.org/wiki/File:Enigma_(crittografia)_-_Museo_scienza_e_tecnologia_Milano.jpg
Local file: /images/history/enigma-milan.jpg

2. Rejewski&Rozycki&Zygalski.jpg
Unknown photographers. Later composite of separate period portraits of
Marian Rejewski, Jerzy Różycki and Henryk Zygalski.
Public domain, as documented on the Commons description page:
https://commons.wikimedia.org/wiki/File:Rejewski%26Rozycki%26Zygalski.jpg
Local file: /images/history/polish-cryptanalysts.jpg

3. Zygalski sheets (perforated sheets).jpg
Photograph: Toby Oxborrow, 2004. Modern demonstration at Bletchley Park.
These are not surviving original 1938 sheets.
License: Creative Commons Attribution-ShareAlike 2.0 Generic
https://creativecommons.org/licenses/by-sa/2.0/
Source and file history:
https://commons.wikimedia.org/wiki/File:Zygalski_sheets_(perforated_sheets).jpg
Local file: /images/history/zygalski-sheets.jpg

ROOM BACKDROP
Atmospheric digital reconstruction supplied by Jimi Plouffe.
Local file: /images/pyry-room.png
Displayed with CSS dimming, vignette and grain. The source PNG is unchanged.
This is not an archival photograph or a documented reproduction of the exact
Pyry interior. No claim about a historical room's precise appearance is made.

MACHINE REFERENCES
The supplied modern colour illustration and Rejewski recollection sketch
remain in /references/. The illustration is credited by Crypto Museum to
theCODEBREAKERS.org. See https://www.cryptomuseum.com/crypto/bombe/ .
Rights to reference images remain with their respective creators.