Ask Wells machine. Get rusty fuse from Dartmoor mines. Give fuse Wells. Ask Wells machine. 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. Now use the time machine again, 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.