View Single Post
Old 06-02-2014, 12:21 AM
Martin Timothy Martin Timothy is offline
Senior Member
Join Date: May 2011
Posts: 727
Default John Harrison's 1730 Marine Clock - The Powder of Sympathy

John Harrison's 1730 Marine Chronometer for determining Longitude - Hitherto the Powder of Sympathy / Dog method was in use, PoS heals at a distance despite momentary pain, thus an injured dog was put on a ship, when its bandage was dipped into the powder at noon in London each day the dog aboard ship yelped.

Last edited by Martin Timothy : 06-02-2014 at 12:37 AM.
Reply With Quote