National Geographic : 1921 Jun
cl-/ODERN Navigation dates from 1762, when John Harri Sson's Chronometer reached the West Indies, after a voyage Sof sixty-one days, with an error of only five seconds. The rich prize which Parliament had offered for halfa century -twenty thousand pounds sterling-went to Harrison. His victory, after thirty years of struggle, hinged on his previous invention of the Compensating Pendulum. The o$15Corsican in yellow gold * * Three Unlike the modern ship's-watch, his timepiece was not suspend- fifths actualsixe* * An ed in gimbals but carried on a pillow. unretouched photograph The world war set new standards in naval timekeeping. The tor pedo boat, with its terrific vibration, baffled America's experts till El gin railroad watches were adapted to the service. And the first accept able ship' s-watches supplied our navy in quantities sufficient to equip the U. S. Emergency Fleets were-as might have been expected- I' i .. .. ,- < ~^' .............. .-... .