in the fall of 1958."" Note that planning at this stage for Trumpet includes some evacuated pipe x-ray measurements underground. A supplement to the program letter dated 21 March 58 was written after Teller took over as Director and goes into possible studies, calculations, tests, and experiments, as well as specific ideas which Livermore has and cannot at the present pursue due to the limitations on manpower that they have to put on projects. After going into several pages of what can be done in each of the major program areas, Teller concludes "The above enumeration clearly indicates that there is far more useful work to be done than a laboratory of the present size of UCRL can possibly do in the immediate future, This poses the difficult and dangerous problem of choosing the ultimately most useful and desirable ideas from among the many promising and in some cases unexplored candidates. We feel that, at least at the present level. limitations of funds should not be the determining factor in our ability to pursue some of this work." The next program letter from Teller following the beginning of the moratorium, dated 25 March 59, states "It is yet too early to evaluate accurately the effects of the test moratorium on the Livermore laboratory. Nor is it possible to predict how fast the science of nuclear weapons will progress if the limitations are to continue. New ways are continuing to be explored that will allow weapons technology to advance even without testing, but it is uncertain at what reduced rate new models of weapons can enter production and stockpile once the backlog of current committments is met. It is certain that if the moratorium continues, weapons will proceed at a muchslower pace than that which was achieved in the past two years when testing was at its peak. The plans for future weapons development at Livermore include new techniques and facilities which will, in some small measure, offset the loss of the testing capability.” As for test readiness,