File:John Harrison tombstone.jpg
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Summary
editJohn Harrison tombstone in Hampstead cemetery. Location Map
The text reads:
Reconstructed at the expense of the worshipeus company of clockmakers of the city of London 1879. William Parker Master
In Memory of Mr. John Harrison, late of Red-Lion Square, London. Inventor of the Time-keeper for ascertaining the Longitude at Sea.
He was Born at Foulby in the County of York, and was the Son of a Builder at that Place, who brought him up to the same Profession.
Before he attained the Age of 21, He without any Instruction employed himself in cleaning & repairing Clocks & Watches & made a few of the former chiefly of Wood. At the Age of 25 He employed his Whole Time in Chronometrical Improvements. He was the Inventor of the Gridiron Pendulum and the Method of preventing the Effect of Heat and Cold upon Time keepers by Two Bars of different Metals fixed together. He Introduced the Secondary Spring to keep them going while winding up and was the Inventor of most (or all) of the Improvements in Clocks & Watches during his Time.
In the Year 1735 his first Time keeper was sent to Lisbon and in 1764 his then much Improved fourth Time keeper having been sent to Barbadoes, the Commissioners of Longitude certified that it had determined the Longitude within one Third of Half a Degree of a great Circle, having erred not more than 40 Seconds in Time.
After near sixty Years close Application to the above Pursuits, he departed this Life on the 24th Day of March 1776, Aged 83.
Mrs Elizabeth Harrison, Wife of the above Mr. John Harrison, departed this Life March 5th 1777, Aged 72.
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current | 17:11, 25 September 2005 | 2,048 × 1,536 (1.47 MB) | Carlomorino (talk | contribs) | John Harrison tombstone in Hampstead cemetery |
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Camera manufacturer | Canon |
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Camera model | Canon PowerShot A400 |
Exposure time | 1/60 sec (0.016666666666667) |
F-number | f/3.8 |
Date and time of data generation | 12:58, 1 August 2005 |
Lens focal length | 8.65625 mm |
Orientation | Normal |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
File change date and time | 12:58, 1 August 2005 |
Y and C positioning | Centered |
Exif version | 2.2 |
Date and time of digitizing | 12:58, 1 August 2005 |
Image compression mode | 5 |
APEX shutter speed | 5.90625 |
APEX aperture | 3.84375 |
APEX exposure bias | 0 |
Maximum land aperture | 3.84375 APEX (f/3.79) |
Metering mode | Pattern |
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Color space | sRGB |
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Focal plane resolution unit | inches |
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Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Auto white balance |
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Scene capture type | Standard |