Sundial with "multitudinous faces"?

Dan'l Danehy-Oakes · 13 May 2011, 19:43 · from 2011-May.txt.gz

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From: danldo at gmail.com (Dan'l Danehy-Oakes)
Date: Fri, 13 May 2011 12:43:09 -0700
Subject: (urth) Sundial with "multitudinous faces"?
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On Fri, May 13, 2011 at 12:26 PM, Jerry Friedman
<jerry_friedman at yahoo.com> wrote:
> For instance, Tipler's rotating cylinders seemed to work
> till somebody found that the "closed time-like loops" were entirely within the
> event horizon, as I recall.

If I recall correctly the spoiler for Tipler cylinders was Hawking's
proof that it would require negative energy in some areas of the local
spacetime.

-- 
Dan'l Danehy-Oakes

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