Courtenay Ilbert Archive

Navigation Improved: In Two Books. Book I. Fluid Quadrant For the Latitude: Book II. Longitude by a New Invention of an Everlasting Horometer

Catalogue no: 1483
Dewey No: Subject(s): Courtenay Ilbert Archive
Author(s): Jacob Rowe
Total pages: 56 Illustrations: 4 Language(s): English Publication date: 1725
Editor: Publisher: The Author?
Dimensions: 200mm x 125mm Condition: Good, a little dirty
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Notes:

Original covers lost, now bound in paper, probably later in the 18th century.  First page bears the stamp of University Library, Cambridge.

A pamphlet published no doubt to be presented to the Board of Longitude in an attempt to win the £20,000 prize.

The first part of the pamphlet concerns a type of quadrant invented by Rowe. 

The second part, pp. 13-47 is an "Essay on the Discovery of the Longitude, By a New Invention of an Everlasting Horometer: Founded on the most Unerring Principles of Nature."

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Account of Captain Scoresby's Magnetical Discoveries, and of his Magnetimeter and Chronometrical Compass

Catalogue no: 1482
Dewey No: Subject(s): Courtenay Ilbert Archive
Author(s): Unknown
Total pages: 14 Illustrations: 2 Language(s): English Publication date: 1823
Editor: Publisher: Edinburgh Philosophical Journal
Dimensions: 210mm x 140mm Condition: Good
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Notes:

Pages extracted from this journal and bound separately between paper covers.

First part of this pamphlet, pp. 41-50, concern Scoresby's experiments with magnetism.

Final pages are concerned with the effects of magnetism on chronometers and their rate.  One solution given is to mount the chronometer on a "Chronometrical Compass" which always keeps them in the same position at sea, with respect to the magnetic meridian.

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Journal of a Voyage to The East Indies in the Ship Grenville, Captain Burnet Abercombie, in the year 1775

Catalogue no: 1481
Dewey No: Subject(s): Courtenay Ilbert Archive
Author(s): Alexander Dalrymple
Total pages: 29 Illustrations: 0 Language(s): English Publication date: c.1776
Editor: Publisher: Unknown
Dimensions: 220mm x 170mm Condition: Good
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Notes:

Bound in paper covers.

Consists of a series of pull-out charts detailing such things as latitude and longitude and weather reports.

On p. 390 is a brief paragraph on the method of determining longitude;  "The correct longitude from Greenwich deduced from the time-keeper corrected by the sight of lands ..." etc.

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Galiano's Voyage to Magellan 1785

Catalogue no: 1480
Dewey No: Subject(s): Courtenay Ilbert Archive
Author(s): Alcala Galiano
Total pages: 3 Illustrations: 0 Language(s): English Publication date: Sept. 1949
Editor: Publisher: Maggs Bro.
Dimensions: 210mm x 140mm Condition: Good
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Notes:

Pages extracted from"Voyages and Travels" catalogue, published by Maggs Bros. and bound separately between card covers.

Precis of the contents of Dionisio Alcala Galiano's logbook of his expedition to the Staits of Magellan, 1785-6.

Information given on the chronometers taken on the voyage by Fernand Berthoud, "Including the No. 10 on account of its accuracy and table of temperature."  Also taken was a deck watch by Arnold.

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Account of a Free Escapement, with considerable reduction of Friction

Catalogue no: 1479
Dewey No: Subject(s): Courtenay Ilbert Archive
Author(s): Urbain Jurgensen
Total pages: 4 Illustrations: 0 Language(s): English Publication date: c.1822
Editor: Publisher: Unknown
Dimensions: 210mm x 135mm Condition: Generally good
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Notes:

Pages extracted from an unknown journal (possibly the Edinburgh Review), and bound separately between marbled paper covers.  Translated and abridged from Shumacher's Astronomische Nachrichten, March 1822.

Urbain (sic) Jurgensen described as "Chronometer-maker to the Danish Navy and Member of the Royal Society of Sciences at Copenhagen."

The author gives a brief precis of the developments in escapements for chronometers before describing his own, a variation of Earnshaw's spring detent escapement but one which utilises two very light escape wheels.

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Annual Report of the Naval Observatory for the Fiscal Year 1926

Catalogue no: 1478
Dewey No: Subject(s): Courtenay Ilbert Archive
Author(s): E.T.Pollock
Total pages: 19 Illustrations: 0 Language(s): English Publication date: 1926
Editor: Publisher: Bureau of Navigation
Dimensions: 230mm x 150mm Condition: Good
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Notes:

AppendixNo.2 to the Annual Report of the Chief of the Bureau of Navigation, 1926.  Navy Department, United States Naval Observatory, Washington, D.C., July 1st, 1926

Information on Time Signals in the USA during the year.

Details of Trials of Chronometers, torpedo-boat watches, patrol-boat watches, clocks and watches.

Much of the pamphlet concerns telescopes, transit instruments etc.

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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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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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