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51 [[underlined]] Scientific Instruments [[underlined]] (continued) Another remarkable dimension is the large Westinghouse-Hibben collection of early incandescent bulbs and vacuum tubes consisting of more than 400 items dating from about 1890 to 1915. Among the most important holdings is a collection of materials relating to Louis Pasteur, including his own laboratory microscope, laboratory slides, and holograph notes relating to his scientific endeavors. [[underlined]] Value of the Gift [[underlined]] The most conservative estimate of the present market value of the proposed gift, made a few years ago, is in excess of ten million dollars, in a field in which the prices realized escalate with considerable rapidity. The value of this resource to the National Museum of History and Technology is beyond estimation. The Museum has achieved world-wide recognition as the most important establishment of its kind not only in the United States but in the world, in which are combined the national museum of national history and the most important center for the study of the history of science and technology.