On Tue, 27 Mar 2012 09:06:30 -0500, John Gilmore wrote: >I like zMan's idea for a two-sided--nanosecond and millimeter--ruler; >his notion that the availability of the second, millimeter side would >make justifying its cost easy is a really inspired piece of nonsense. > >I wish I'd thought of it. > Earlier in this thread someone said 11 inches. Elsewhere, I've seen 9 inches or 8 inches. It depends largely on the speed of light in the insulation of the wire, which is not well controlled. Precise rulers are calibrated at a specific temperature; the nanosecond ruler needs to be calibrated for a specific propagation medium.
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