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Reconstruction Of The John Harrison H4, The World’s First Precision Marine Chronometer, By Derek Pratt And Roger Stevenson/Frodsham | Quill & Pad

Reconstruction Of The John Harrison H4, The World’s First Precision Marine Chronometer, By Derek Pratt And Roger Stevenson/Frodsham | Quill & Pad

Back in 2017 we ran a fascinating three-section arrangement chronicling the creation of Derek Pratt’s H4 reproduction by Roger Stevenson, boss watchmaker at Frodshams. These articles were first distributed in the The Horological Journal (HJ) in February 2015 and we express gratitude toward them again for consent to republish here on Quill & Pad.

Derek Pratt’s H4 remaking showing the completed development and Charles Scarr’s puncturing and engraving

I thought it well worth causing you to notice this arrangement by and by on the off chance that you missed it the first run through around.

To see each staggeringly investigated and luxuriously showed a piece of the arrangement, click the connections below.

Derek Pratt’s Reconstruction Of John Harrison’s H4, The World’s First Precision Marine Chronometer (Part 1 of 3)

Making The Diamond Pallets For Derek Pratt’s Reconstruction Of John Harrison’s H4, The World’s First Precision Marine Chronometer (Part 2 of 3)

Making The Escapement, Remontoir, And Timing For Derek Pratt’s Reconstruction Of John Harrison’s H4, The World’s First Precision Marine Chronometer (Part 3 of 3)

You can purchase a DVD of the film about Derek Pratt’s H4 remaking at www.bdvideos.co.uk/site/shop/horology/a-definite investigation of-h4/(all benefits go to the foundation Prostate Cancer UK.)

For more data, kindly visit www.frodsham.com/harrison-h4 .

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