timesofindia on Nostr: The isolator helmet: How Hugo Gernsback’s bizarre 1925 invention was designed to ...

The isolator helmet: How Hugo Gernsback’s bizarre 1925 invention was designed to block 95% of sound and induce total concentration amongst workers and inventors
https://timesofindia.indiatimes.com/science/the-isolator-helmet-how-hugo-gernsbacks-bizarre-1925-invention-was-designed-to-block-95-of-sound-and-induce-total-concentration-amongst-workers-and-inventors/articleshow/131172162.cms