John Harrison's Clocks-video/no printing

John Harrison's historic "longitudinal clocks" ( H-1 in 1730s, H-2, H-3 and finally H-4 in 1764), illustrated the nexus between time ( a clock ) and distance travelled along east-west longitudinal world lines; hence, space-time! And it was these "longitudinal clocks" that transformed little England into Great Britain able to place men and guns at precise time and locations on the Earth and therefore Ruled the Waves, Continents and Populations.

"The clock, not the steam engine, is central to the industrial revolution. The clock is the crowning achievement that all other machines aspire to."
Louis Mumford ( 1895 - 1990 )

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