In October 1707, British Admiral Sir Cloudesley Shovell led a fleet of several ships. Due to errors in longitude calculations, the fleet eventually crashed in the Isles of Scilly in southwest England. The admiral And nearly 2,000 crew members were killed.
At that time, dominating the ocean was one of the core issues of the British Empire’s politics and economy. This tragedy prompted the government to mobilize the entire scientific community to overcome the same problem: how to calculate longitude accurately at sea. To this end, the British Parliament passed the Longitude Act in 1714, offering a reward of 20,000 pounds (equivalent to millions of dollars today!), In order to reward scientists for inventing a method that can make the error accurate to about half a degree (Ie about 30 km) at sea.
The greatest scientists are involved in this challenge. John Harrison’s research seems to be the simplest and has many advantages: the time difference between the starting point and the ship’s position is measured by a clock to determine the longitude. The earth rotates about 24 hours a week. Therefore, an hour is equivalent to 15 degrees of rotation of the earth, or a longitude difference of 15 degrees. Then, by using a sextant to determine the exact time of the ship’s location, and using a clock to indicate the exact time of the reference meridian (the starting point), the time difference between the two places can be calculated, and the longitude of the ship can be known. The next challenge is how to make timepieces that are accurate enough to adapt to changing sea travel.
John Harrison worked hard to finally solve this problem. Born on March 24, 1693, John Harrison is a self-taught watchmaker who was born as a carpenter and devoted his life to developing precision timepieces. He used the spiral hairspring invented by Christian Huygens and Robert Hooke to make a new mechanical device, while using brass and steel alloys to effectively control metal tension.
In 1773, John Harrison ruled out the hard-to-invent H-4 navigation watch and finally gained recognition for its outstanding performance. He also received part of the reward promised by the Longitude Act. Due to the fierce competition surrounding this challenge and the ambiguity of the award conditions, bonuses have never been paid in full.
The history of GP Girard Perregaux is the history of perseverance and the pursuit of precise timing technology. Today, the watch factory has created a new exclusive model of the ww.tc (world wide time control) € time series, paying tribute to this outstanding master watchmaker of the 18th century.
On the dial of this outstanding watch is an Atlantic chart depicting the navigation of William Harrison, son of John Harrison, from Portsmouth, England, to Port-Royal, Jamaica. The sailing journey lasted from November 1761 to March 1762. The purpose was to test the reliability of the H-4 navigator. This longevity navigator is much smaller than the previous prototypes. For example, the H-1 navigation instrument weighs 32.5 kg.
The dial of the ww.tc John Harrison watch is the result of condensed exquisite enamel painting process, carefully crafted by GP Girard-Perregaux enamel workshop. Coast contours were first carved on an unprocessed platinum face plate. Exquisite eight-direction wind direction map, the size does not exceed 3 mm, and is carved by hand by a sculptor. The craftsman then filled the hollowed out area with a green or blue enamel liquid paint with a brush. After baking the enamel pigment in a furnace with a temperature of up to 800 degrees Celsius for a certain period of time, a translucent glass-like effect is obtained. After it has cooled, place it in water and grind off the excess enamel with hard stone sandpaper. Then, the dial is manually polished with a diamond file, and then subjected to a final firing, a process called ‘dorure’, which makes the enamel shine brightly. William Harrison’s sailing route from Europe to the Americas is carefully traced with silver powder.
To cope with the dial, the names of ‘Portsmouth’ and ‘Royal Port’ are displayed in royal blue on the city display ring. The city display ring with the carved GP logo is located at 9 o’clock and can be activated by the platinum crown. In addition to displaying the local time, this watch also displays the time around the world simultaneously with a blue / white two-tone time display ring and a rhodium-plated leaf minute hand.
The delicately carved hands glide across the enamel-painted dial, solemn and elegant. The white gold case is alternately polished and matte, with exquisite workmanship and well-proportioned proportions. Through the transparent chassis, you can enjoy the precise operation of GP Girard Perregaux and the outstanding automatic GP 033G0 movement. The movement is equipped with a clever adjustment mechanism that drives a two-color time display ring to display the time in 24 time zones. Pay the highest tribute to this great journey of watches and clocks, and specifically sculpt the important date of sailing with the H-4 navigation instrument on the rose gold pendulum. The ww.tc John Harrison watch is limited to 50 pieces worldwide, each of which is individually engraved.
Case: 18K white gold
Diameter: 41 mm
Thickness: 11 mm
Table mirror: anti-reflective sapphire crystal
Case back: Sapphire crystal, fixed by six screws
Water resistance: 50 meters
Painted enamel dial
Girard Perregaux automatic winding movement GP033G0
Movement size: 11 ½ minutes
Vibration frequency: 28,800 times per hour (4 Hz)
Power reserve: at least 46 hours
Functions: hour, minute display, world time zone with day / night indication € display
Black alligator strap
Buckle: Platinum folding buckle
Limited to 50 pieces worldwide