John Harrison’s fourth marine timekeeper, known today as ‘H4’© NATIONAL MARITIME MUSEUM, GREENWICH, LONDON, MINISTRY OF DEFENCE ART COLLECTION

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The Marine ChronometerIts History and Development

incorporating Gould’s own amendments and additions from his original annotated manuscripts

Rupert T. Gould

With new illustrations and a foreword to this edition by

Jonathan Betts MBE

Antique Collectors’ Club

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CONTENTSto this edition

Publisher’s note . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .V

Foreword to the Second EditionJonathan Betts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .X

Gallery of Chronometers . . . . . . . . . . . . . . . . . . . .XVIII

Facsimile of Gould’s handwritten preliminary notes for his planned 2nd Edition . . . . . . . . . . . . . . .LIV

***

The Marine Chronometer – Its History and Development by Lt.-Commander Rupert T. Gould . . . . .i

Full contents to the original book . . . . . . . . . . . . . . . . .ix

—John Harrison’s fifth marine timekeeper, ‘H5’.© NATIONAL MARITIME MUSEUM, GREENWICH, LONDON / CLOCKMAKERS’ COMPANY MUSEUM

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XIX

Plate 9. The back of the Sullymarine timekeeper shown in PlateII, now in the Clockmakers’Company Collection

Plate 10. John Harrison (1693-1776) in theportrait by Thomas King, c.1765 (see Frontispieceopposite original Title Page, and p.40)

© SCIENCE MUSEUM / SCIENCE & SOCIETY PICTURE LIBRARY

Plate 11. Vitreous enamel portrait of JohnHarrison by James Tassie (1735-1799), c.1775,now in the Clockmakers’ Company Collection (seeFrontispiece opposite original Title Page, and p.40)

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XX

Above: Plate 12. H1 after and before cleaning in 1920(see Plates VI and VII) COURTESY SIMON AND SARAH STACEY

Left: Plate 13. The decorative pieces in the motion work ofH1 – unseen when the timekeeper is complete (see PlatesVI and VII) © NATIONAL MARITIME MUSEUM, GREENWICH, LONDON,

MINISTRY OF DEFENCE ART COLLECTION

Below: Plate 14. H1 being taken apart by Jonathan Bettsat the Royal Observatory in 2010 (see Plates VI and VII)

© NATIONAL MARITIME MUSEUM, GREENWICH, LONDON,

MINISTRY OF DEFENCE ART COLLECTION

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XXI

Plate 15. H1 today (see Plates VI and VII) © NATIONAL MARITIME MUSEUM, GREENWICH, LONDON, MINISTRY OF DEFENCE ART COLLECTION

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XXII

Plate 16. H2 from three-quarter view mounted on the base of its first (1920s)showcase (see Plate VIII)

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XXVI

Above left: Plate 20. The under-dial work ofH4 (see Plate XI)

Above right: Plate 21. H4 today (see Plate XII)© NATIONAL MARITIME MUSEUM, GREENWICH, LONDON,

MINISTRY OF DEFENCE ART COLLECTION

Left: Plate 22. H4 today, the movement(see Plate XI)© NATIONAL MARITIME MUSEUM, GREENWICH, LONDON,

MINISTRY OF DEFENCE ART COLLECTION

Opposite: Plate 23. H5 today, complete withits outercase (see Plate XIII)© NATIONAL MARITIME MUSEUM, GREENWICH, LONDON /

CLOCKMAKERS’ COMPANY MUSEUM

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XXVII

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XXIX

Plate 26. K1 today, the movement (see p.71)© NATIONAL MARITIME MUSEUM, GREENWICH, LONDON, MINISTRY OF DEFENCE ART COLLECTION

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LIV

[B]

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JOHN HARRISON.From a mezzotint by Tassaert, published in 1768, after a painting by King. A copy of thispainting is exhibited in the Science Museum, South Kensington. The machine behind Harrisonis his No. 3 (drawn too large), and that at his right hand No. 4.See p. 41, f.

---Note. This type of wig was called a “Garrick cut”, having been introduced by the famous actor.[B]

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