Hi @medro-martin, great write-up.
Crookes Tube CRT, Wikipedia | License: CC BY-SA-3.0
Davisson Germer Setup Diagram, Wikipedia | License: CC BY-SA 3.0
Electron Gun from a CRT, Wikipedia | License:Public Domain
Diffraction Pattern of red laser, Wikipedia | License: CC BY-SA 3.0
LEED Image, WIkipedia | License: CC BY-SA 3.0
For clarity and ease, preferably, pls do insert the link to the image
Thanks. Done