From Flickr: “Marconi Sounding Device in wartime, advert 1944” by mikeyashworth

As this simple advert notes wartime conditions made the use of radio echometer sounding devices even more critical. The company appears to have been associated with the Marconi International Marine Communications Co Ltd who were major players in the development and supply of maritime radiotelegraphy services.

via Flickr https://flic.kr/p/2d8bjgj

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