isoteniscope
Isoteniscope is a term that has appeared in historical and speculative scientific literature to denote an instrument purported to analyze isotopic composition. It is not part of standard modern nomenclature, and there is no universally accepted definition. In various early sources, an isoteniscope was described as a device intended to compare isotopes by exploiting small differences in physical properties—such as diffusion rates, refractive indices, or chemical behavior—between isotopic species. Other references treat the term as a theoretical or hypothetical instrument proposed before the development of contemporary isotope measurement techniques. Because the concept lacks a fixed specification, the exact design and operation of an isoteniscope varied by author and era.
By the mid-20th century, practical isotope analysis had largely moved to established techniques such as isotope-ratio
See also: isotope analysis, mass spectrometry, isotope ratio mass spectrometry, diffusion methods, spectroscopy.