It was finally agreed that the necessary plans and blueprints were to be given to the Nansalians, who could start production at once. The biggest problem was in the supply of lux and relux, which, because of their vast energy-content, required the atomic converters of the _Ancient Mariner_ to make them. The Earthmen agreed to supply the power and the necessary materials to begin operations. When the ship landed, a meeting of the manufacturers was called. Fuller distributed prints of the microfilmed plans for the equipment that he had packed in the library, and the factory engineers worked from them to build the necessary equipment. The days that followed were busy days for Earthmen and Nansalians alike. The Nansalians were fearful of the consequences of the weapon that the Satorians were rumored to have. The results of their investigations through their agents had, so far, resulted only in the death of the secret service men. All that was known was exactly what the Satorians wanted them to know; the instrument was new, and it was deadly. On the other hand, the Satorians were not entirely in the dark as to the progress of Nansal, as Arcot and Morey discovered one day. After months of work designing and tooling up the Nansalian factories, making the tools to make the tools to make the war material needed, and training the engineers of Nansal all over the planet to produce the equipment needed, Arcot and Morey finally found time to take a few days off. Tharlano had begun a systematic search of the known nebulae, comparing them with the photographs the Earthmen had given him, and looking for a galaxy with two satellite star clouds of exactly the right size and distance from the great spiral. After months of work, he had finally picked one which filled the bill exactly! He invited Arcot and Morey to the observatory to confirm his findings. The observatory was located on the barren peak of a great mountain more than nine miles high. It was almost the perfect place for an astronomical telescope. Here, well above the troposphere, the air was thin and always clear. The solid rock of the mountain was far from disturbing influences which might cause any vibration in the telescope. The observatory was accessible only from a spaceship or air flyer, and, at that altitude, had to be pressurized and sealed against the thin, cold air outside. Within, the temperature was kept constant to a fraction of a degree to keep thermal expansion from throwing the mirror out of true. Arcot and Morey, accompanied by Tharlano and Torlos, settled the _Ancient Mariner_ to the landing field that had been blasted out of the rock of the towering mountain. They went over to the observatory and were at once admitted to the airlock. The floor was of smoothed, solid rock, and in this, the great clock which timed and moved the telescope was set.