This is a contemporary account of the discovery of Pluto. At the time it had not yet been named. The article lists Atlas, Prometheus, and Pluto as suggested possibilities.
How They Trailed a New Planet
Study of many photos of stars disclosed to a farm boy what may prove a new world where a famous astronomer said it would be. Old theories are upset by find.
ALDEN P. ARMAGNAC
A NEW planet has been announced. Out in space, four billion miles beyond the globe we live on, a yellowish object, a little larger than the earth, swings in a vast circle about the sun; a frigid little world, bathed in the dim light of perpetual dusk. Its discovery is called the most important event in astronomy in nearly a hundred years.
A new planet is not found every day. As many of us learned in school, a planet is one of the exclusive company of heavenly bodies that get their light and heat from the sun. They swing about it, as the earth does, in great circular paths, or orbits. These earthlike worlds are so few in number that they may be counted on the fingers.