Speculations Concerning Present and Future Developments In Indicator‐Dilution Technics

• Speculations to be of appreciable value should be based on (1) thorough knowledge of the past and (2) as realistic as possible prediction of the needs of the future. Then from a knowledge of these two factors, perhaps an educated guess can be made as to how the developments and capabilities from the past up to the present may be extended and synthesized with the needs of the future in order to fulfill these needs. The past aspects of indicator-dilution technics are well covered by Fox in another section of this symposium and will not be touched on further here. The remainder of this discussion therefore will be concerned with present and future developments. All past and future developments are determined by two factors: (1) the development of completely new concepts or the variation of old concepts based on known or newly discovered information and (2) the availability or adaptation of technics and instrumentation to obtain the data required to test and utilize these concepts. Discussion will be carried out along the lines of these two considerations. It is a truism that the development of a really new concept is indeed a very rare occurrence ; obviously, therefore, no really new concepts will be covered in this presentation. The development of new technics and instrumentation, like the development of new concepts, is actually nearly always the further development, adaptation or refinement of previous technics and instrumentation. Such new developments occur with a much greater frequency than do the development of new

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