Many thanks to SWLing Post contributor, Mark (AE2EA), who shares the following AWA video about crystal production during WWII:
Click here to view on YouTube.
Thank you so much for sharing this, Mark. I posted the original film of this a few years ago, but it appears that the YouTube account has been deleted. I’m grateful the Antique Wireless Association has published this. Thank you for the tip!
Many thanks to SWLing Post contributor, Charlie (W4MEC), who shares this fascinating film which documents the production and calibration of crystals in 1943. I had no idea of the amount of labor and attention to detail this process required–an absolutely fascinating process:
UPDATE (08/09/2022): the YouTube account associated with this film has been deleted by the owner.
Click here to view this same film now hosted by the Antique Wireless Association.