Ask Wells machine.
Get rusty fuse from Dartmoor mines.
Give fuse Wells. Ask Wells machine.
Go down, Sit machine
Push red, push green.
You are transported to a museum, get book pedestal.
You are transported again to a house with a desk, put book desk.
You are transported back to Wells, ask Wells machine.
Go down and sit machine, push red, push orange, you end up in a different industrial London with the Young Professor Moriarty in a room to the north. NOTE - if you go west or south you will be transported back to normal London, in which case you can use the time machine to get back to Moriarty.