On Sunday, August 26, 2018 at 8:53:52 AM UTC-7, Michael Black wrote:
On Sun, 26 Aug 2018, wrote:
(a bunch of drivel by allisellis851 @ gmail.com ; I am surprised you bother to read them)


I don't think that's going to work.

I found a small book at a used book sale a few years ago, maybe titled
"Chronograph". It was about the need time in order to navigate. One of
them, longitude or latitude, required accurate time, and ships didn't have
that. Hence an effort to create a very accurate clock, which was also
portable.

I think you may mean "Longitude", which tells the story of how, in 1761, John Harrison invented the first chronometer that was capable of meeting the Royal Navy's challenge. It is a book and a movie available on DVD. Four of his clocks are on display at the museum of the Naval Observatory Greenwich, and three of them are kept running.