From johno12345:

Quote

Heat Treatment MG set
This is thought to be the newer motor generator set and runs at 297Hz, I think it might be in need of a wipe over - it is actually royal blue.

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Close-up:
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High Cycle Grinder
The sole reason we have these sets. These grinders are quite old and I am led to believe that they don't slow down when pressure is applied making them excellent for grinding metal for a Brinell test.

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High Cycle Socket & Plug
Socket and plug on the High frequency network. These are standard Lewden sockets and care has to be taken not to plug a welder into these sockets as they are the same.

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