[Physics] Arguments for or against the variable time

[O. Serret]

Dear Randy,

Thank you for your explanation. I will be very interested to know the result if you can do the experience with another fluid.

And I have a question on the experiment you did. You write :
> page 298 : copper tubes ½ inch (= 1.27 cm)
> page 298 : the tubes were five feet long with an internal diameter of 1.27 cm.
> page 301 :  the characteristic length or diameter of the pipe X = 2.54 × 10-2 m 

Which internal diameter did you use ? 2.54 or 1.27 cm ?

Thank you, and best regards
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