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The Man who Discovered the Longitude, 1736. John Harrison and his Timekeepers

Catalogue no: 1477
Dewey No: Subject(s): Courtenay Ilbert Archive
Author(s): Commander R.T.Gould
Total pages: 4 Illustrations: 4 Language(s): English Publication date: Dec., 1936
Editor: Publisher: The Listener, BBC
Dimensions: 330mm x 240mm Condition: Reasonable, pages yellowing
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An article written shortly prior to the opening of the new National Maritime Museum at Greenwich where the Harrison chronometers would be displayed together for the first time.

The author gives a brief biography of Harrison and details some of the work that he (Gould) had undertaken on the Harrison chronometers since 1920

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Search terms: Chronometers, John Harrison
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On Nautical Inventions

Catalogue no: 1476
Dewey No: Subject(s): Courtenay Ilbert Archive
Author(s): Unknown
Total pages: 16 Illustrations: 0 Language(s): English Publication date: March, 1839
Editor: Publisher: United Service Journal
Dimensions: 230mm x 145mm Condition: Reasonable, though covers missing, end pages dirty
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Notes:

On front page after title, Ilbert writes in ink, "With a cursory glance at the rise and progress of Horology."

In fact, this piece has more to do with the development of the chronometer from the 17th century and of the invention of other devices (quadrants, sextants ect.) used to determine latitude and longitude.

Includes references to clocks and watches in literature, eg. Chaucer, Shakespeare.

Interesting and perhaps apocryphal snippet about a John Harrison longcase clock found in Lincoln in 1798.

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The Prize Chronometer

Catalogue no: 1475
Dewey No: Subject(s): Courtenay Ilbert Archive
Author(s): G. Muston
Total pages: 8 Illustrations: 0 Language(s): English Publication date: May, 1825
Editor: Publisher: Mechanics' Magazine
Dimensions: 220mm x 130mm Condition: Reasonable
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Notes:

Consists of an announcement followed by two long letters from Muston.

Begins with short announcement to say that the prize of £300 from the Admiralty for the best chronometer after a year's trial at Greenwich, has been awarded to Mr R. Widenham of East-street, Red Lion-square, "a very young and ingenious artist."

There follows two lengthy letters from Muston, in reply to two letters in previous Mechanics' Magazines, signed "A Real Workman" and which are, sadly, not included but which relate to the prize chronometer.

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Glass Balance-Springs to Chronometers

Catalogue no: 1474
Dewey No: Subject(s): Courtenay Ilbert Archive
Author(s): Arnold and Dent
Total pages: 8 Illustrations: 0 Language(s): English Publication date: 1833-4
Editor: Publisher: Nautical Magazine
Dimensions: 235mm x 150mm Condition: Fragile with torn and soiled pages
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Notes:

Two long letters from Arnold and Dent on this subject, published in two issues of the Nautical Magazine, (Nos. XIV and XXIX).

Reasons for the introduction of the glass balance spring explained and details of experiments given.

Final page is a chart showing "Rate of Arnold and Dent's Chronometer, N. 616, with glass balance-spring", over the period 1st January to 31st May, 1834.

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John Harrison, the Chronometer-Maker

Catalogue no: 1473
Dewey No: Subject(s): Courtenay Ilbert Archive
Author(s): S.Smiles
Total pages: 16 Illustrations: 0 Language(s): English Publication date: 1883
Editor: Publisher: Longman's Magazine
Dimensions: 210mm x 140mm Condition: Good
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pp. 156-171 extracted from the 1883 edition of this journal and stapled and glued between card covers.

A short biography of John Harrison.

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Regulations for the Testing of Marine Chronometers and other Scientific Apparatus, with Appendix containing Details of Trials for Watches, &c.

Catalogue no: 1472
Dewey No: Subject(s): Courtenay Ilbert Archive
Author(s): William E. Plummer
Total pages: 10 Illustrations: 0 Language(s): English Publication date: 1906
Editor: Publisher: Mersey Docks and Harbour Board
Dimensions: 220mm x 140mm Condition: Good, covers a little dirty
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Published by the Mersey Docks and Harbour Board on behalf of the Liverpool Observatory, Bidston, Birkenhead.

"Regulations for testing the Thermal Adjustments of Marine Chronometers, and for the examination of other scientific apparatus at the Observatory, Bidston."

Includes a schedule of costs incurred for the trials and testing of the following;

Marine Chronometers; Watches and Chronometers (other than Marine); Sextants, Theodolites and Compasses; Telescopes and Binoculars; Barometers and Aneroids; Thermometers; Miscellaneous.

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Regulations for the Testing of Marine Chronometers, and Other Scientific Apparatus with Appendix containing Remarks on Rating and Testing Marine Chronometers and Details of Trials for Watches, &c.

Catalogue no: 1471
Dewey No: Subject(s): Courtenay Ilbert Archive
Author(s): William E. Plummer
Total pages: 23 Illustrations: 0 Language(s): English Publication date: 1893
Editor: Publisher: Mersey Docks and Harbour Board
Dimensions: 220mm x 140mm Condition: Good, cover dirty
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Notes:

Published by the Mersey Docks and Harbour Board for the Liverpool Observatory, Bidston, Birkenhead.

"Regulations for testing the Thermal Adjustments of Marine Chronometers, and for the examination of other scientific apparatus at the Observatory at Bidston."

Includes a schedule of costs incurred for the testing of the following instruments;

Watches and Chronometers; Sextants, Theodolites and Compasses; Telescopes and Binoculars; Barometers and Aneroids; Thermometers; Miscellaneous.

pp. 7-11, Appendix. As to the Rating and Testing of Marine Chronometers.

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E.S.Eiffe's Patents of 1848, followed by an interesting letter of Charles Frodsham also Eiffe's reply

Catalogue no: 1470
Dewey No: Subject(s): Courtenay Ilbert Archive
Author(s): J.S.Eiffe, Charles Frodsham
Total pages: 6 Illustrations: 2 Language(s): English Publication date: 1848
Editor: Publisher: The Patent Journal
Dimensions: 220mm x 130mm Condition: Pages yellowing, some tears and staining
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pp. 498-500 and 611-614 extracted from the Patent Journal and roughly bound between paper covers.  Title written in ink on front cover, not in Ilbert's hand.

Details of patent:  James Sweetman Eiffe, Esq., of 48 Lombard-street, City, for certain improvements in the manufacture of astronomical and other clocks, chronometers and watches.  Patent dated December 7th, 1847. Enrolled March 31st, 1848.

Patent concerns the arms of the balance constructed out of the radial line.

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Search terms: Chronometers, Temperature Compensation
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Description of a Compensation Curb

Catalogue no: 1469
Dewey No: Subject(s): Courtenay Ilbert Archive
Author(s): James Scott
Total pages: 4 Illustrations: 1 Language(s): English Publication date: 1805
Editor: Publisher: Unknown
Dimensions: 220mm x 140mm Condition: Good
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Notes:

pp 19-22 extracted from a publication (Ilbert's note states "Nicholson's phil Jul. 1805), and bound between paper covers.  Written on cover in ink, "Monsieur C.W.Cooke.  Hommage de l'auteur."

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Chronometer-Accuracy: Verification of the Longitude of Paris

Catalogue no: 1468
Dewey No: Subject(s): Courtenay Ilbert Archive
Author(s): Unknown
Total pages: 12 Illustrations: 0 Language(s): English Publication date: June, 1838
Editor: Publisher: The Nautical Magazine
Dimensions: 220mm x 140mm Condition: Reasonable but cover fragile and torn
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An extract from The Nautical Magazine, published under separate covers.

The pamphlet (possibly written by Arnold and Dent) describes an experiment carried out by Messrs. Arnold and Dent.  "The proposition was to select two meridians, the difference of longitude between which was considered to be accurately obtained, and then by transporting the chronometers from one of these meridians to the other, to ascertain the difference of longitude given by them, and compare it with the difference previously received as correct."

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