The professor asks for your help, the idea presented by his assistant, in rebuilding the telescope. When you agree, he'll ask you to get some materials for the telescope parts. First, he asks you to provide him with 3 wooden planks for the telescope base. Talk to the assistant, then the professor to turn it in. Next, give him a bronze bar for the tube and some molten glass for the lens. To make the lens into an exact shape and size, you'll need a lens mould which, unfortunately, the goblins have stolen.