The differences in the reported half lives are a consequence of improved methods and instruments, and the care with which the individual measurements were made. For example, Kirby and others 74 argue convincingly that the measurements of the half life of Ra reported from to Table 3 suffered from inadequate experimental methods and are not definitive.
Kirby and his colleagues carefully measured this half life by two different methods and obtained values of The weighted mean of these two measurements is I should also mention that the two references cited by Rybka are textbooks, not the publications in which the original data were reported; the dates of publication of these texts, therefore, do not reflect the years in which the measurements were made or reported. Rybka also explores the hook up barber shop consequences of a hypothetical change over time of the decay constant, but his results are due solely to his arbitrary changes in the decay formula в changes for which there is neither a theoretical basis nor a shred of physical evidence.
There have been no changes observed in the decay constants of those isotopes used for dating, and the changes induced in the decay rates of other radioactive isotopes are negligible.
Brown leather ends stayed the same. The interior burnt-orange plush used from stayed until about when the interior of the cases changed to a dark orange plush. Also around the center manual latch changed positions from under the case handle, to just outside of the case handle the latch's postion could hurt your knuckles when carrying the case.
Click here for a picture of the early square style Fender cases from mid to This picture includes the ""center pocket"" tweed case, the ""side pocket Koylon"" tweed case, the ""side pocket burnt orange"" tweed case, and the style ""brown"" case with the dark orange interior.
The only case missing from this photo is the to style ""brown"" case with the lighter colored burnt orange interior. In to earlythe exterior again changed on Fender cases. The hook up barber shop white tolex with black leather ends was the standard. The interior stayed the same dark orange plush.
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