Fromm went immediately back to work. Part of him was already counting the money he'd receive, but most concerned itself with the job at hand. Only half of the machinists had actually worked on the bomb's physics package itself. The rest had been employed entirely with manufacturing other fittings, most of which could be called cradles. These would hold the bomb components in place, and were mainly made from stainless steel for strength and compactness. Each was set in place according to a precise sequence, as the bomb was more complex than most machines, and required assembly according to a rigid set of instructions. Here again the process was made simpler by the quality of the design and the precision of the machine tools. Even the machinists were amazed that the parts all fit, and they murmured among themselves that whatever Fromm might be - and on this subject their speculation had been wide-ranging and colorful - he was an inhumanly skilled designer. The hardest part was installing the various uranium blocks. Installation of the lighter and milder materials went much more smoothly.

"The procedure for the tritium transfer?" Ghosn asked.

"We'll leave that for last, of course," Fromm said, backing off from checking a measurement.

"Just heat the battery to release the gas, correct?"

"Yes," Fromm said with a nod. "But - no, no, not that way!"

"What did I do wrong?"

"This must twist in," Fromm told the machinist. He stepped forward to demonstrate. "Like that, do you see?"

"Yes, thank you."

"The elliptical reflectors hang on these -"

"Yes, thank you, I know."

"Very good."

Fromm waved to Ghosn. "Come over here. You see how this works now?" Fromm pointed to two series of elliptical surfaces which nested together one after the other - there was a total of nineteen - each made of a different material. The energy off the Primary impacts of these surfaces, destroying each in its turn, but in the process "

"Yes, it is always more clear to see the physical model than to extract it from a sheet of figures." This portion of the weapon derived its utility from the fact that light waves had no mass but did carry momentum. They were not 'light' waves at all, technically speaking, but since the energy was all in the form of photons the same principle held. The energy would immolate each of the elliptical surfaces, but in the process each surface would transfer a small but reliable percentage of the energy in another direction, adding to the energy already headed that way from the Primary itself.

"Your energy budget is lavish, Herr Fromm," Ghosn observed not for the first time.

The German shrugged. "Yes, it must be. If you cannot test, you must over-engineer. The first American bomb - the one used on Hiroshima - was an untested design. It was wasteful of materials and disgustingly inefficient, but it was over-engineered. And it did work. With a proper test program " With a proper test program he could measure the empirical effects, determine exactly what the necessary energy budget was, and how well he managed it, determine the exact performance of each component, improve those that needed improvement, and reduce the size of those which were too large or too massive for the task at hand, just as the Americans, and Russians, and British, and French had done over a period of decades, constantly refining their designs, making them more and more efficient, and because of that, smaller, lighter, simpler, more reliable, less expensive. This, Fromm thought, was the ultimate engineering discipline, and he was immeasurably grateful that he had finally gotten the chance to try his hand at it. This design was crude and heavy, no masterpiece of design. It would function - of that he was certain - but with time he could have done so much better