Here are a couple of rather lovely little videos I found on the British Pathé website:
It was a certain Mr Clarence Birdseye, himself an American, who invented and revolutionised the concept of frozen food. Frozen food was a challenge then, not just because of the freezing process, but also because in order to sell frozen products, you also have to convince people to buy a freezer to put the product in. Luckily for Clarence his invention took off and he sold his patent for a ludicrously large sum of money.
Freezing had been around before – but at a relatively high temperature and quite slow. This meant when the product thawed, it was dry or mushy and of low quality. Birdseye created the technology to freeze things fast and at a much lower temperature – an idea he got from the Inuit! When he expanded his inventions to plate freezers, the application for using them on board ships became apparent. The rest, as they say, is history.
Echo sounder, fish finder, sonar, ASDIC – these are terms that have been common to us in the last 50 years – but sonar and ASDIC have a history that runs on to a century now. Developments were started in the 1910’s, but it was during WWI which really kick-started the whole thing with the sudden need to detect submarines. ASDIC was born and developed In 1916-17. Further developments came in WWII, and it after WWII that detection devices entered civilian usage. Strangely enough, there is no proven origin meaning for the initials ASDIC – the theory is that it was derived from the cover name for the project in WWI, it was kept so secret. Sonar came during the 1930’s, and was primarily an American development.
The one is my favourite though – and was something that had never occurred to me as a possibility in ration-stricken Britain: