Clyde Tombaugh: It wasn’t a very good one because it had such meager instructions. It worked fairly well but not good enough to suit me. So the following year, the Scientific American published a book called Amateur Telescope Making. I bought a copy, and I digested it, and I realized where I’d made mistakes. So the next telescopes were much better because they had the benefit of more information. The nine-inch, for instance, in my backyard — you probably saw it there — was the third telescope of excellent quality. It was the drawings I made of the markings on Mars and Jupiter with that telescope, that I sent to the Lowell Observatory in 1928, that impressed them favorably so that they invited me to come out for a trial work with the new telescope at Flagstaff. So that was a big break.