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TonyDuell · 10th Dec 2018, 6:08 am

Those 'connection boxes' were officially called 'Blocks, Terminal'. The one in post #16 looks to be a 'Block, Terminal 52'. Anyway, 'Block Terminal' is commonly abbreviated to 'BT' on diagrams, etc which causes a lot of confusion with newcomers now who think it stands for 'Briitish Telecom' (which of course didn't exist when said diagrams were drawn)

10th Dec 2018, 6:08 am	#17
TonyDuell Dekatron Join Date: Jun 2015 Location: Biggin Hill, London, UK. Posts: 5,208	Re: What is this for?? Those 'connection boxes' were officially called 'Blocks, Terminal'. The one in post #16 looks to be a 'Block, Terminal 52'. Anyway, 'Block Terminal' is commonly abbreviated to 'BT' on diagrams, etc which causes a lot of confusion with newcomers now who think it stands for 'Briitish Telecom' (which of course didn't exist when said diagrams were drawn)