Book excerpt: Excerpt from Journal of Research of the National Institute of Standards and Technology, Vol. 95: March-April 1990 A small prototype chamber, which measures m, has been constructed by nist and delivered to another government agency. Ini tial tests with the chamber have shown the poten tial for significant cost and time savings. A paper, no. 52-89, describing the chamber is available from Jo Emery, nist, Div. 104, Boulder, CO 80803; telephone: -3237. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.