Precision Timekeeping

Professor Bond's Clock for Registering Astronomical Observations by Electricity

Catalogue no: 1504
Dewey No: Subject(s): Courtenay Ilbert Archive
Author(s): Unknown
Total pages: 4 Illustrations: 0 Language(s): English Publication date: 1851
Editor: Publisher: Chamber's Edinburgh Journal
Dimensions: 250mm x 170mm Condition: Good
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Notes:

Pages extracted from this journal and stapled together between card covers.

Under the title, "A Peep into the Observatory", a full account is given on the subject of Harvard University professor Bond's new device.

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Observations for ascertaining the length of the Pendulum at Madras in the East Indies,... with the conclusions drawn from the same.

Catalogue no: 1501
Dewey No: 681.1124 Subject(s): Courtenay Ilbert Archive
Author(s): John Goldingham
Total pages: 43 Illustrations: 1 Language(s): English Publication date: 1822
Editor: Publisher: Unknown
Dimensions: 270mm x 210mm Condition: Good, first page slightly dirty
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The author describes the experiments carried out using a regulator timepiece with grid-iron pendulum by Haswell, together with apparatus designed for such experiments by Captain Kater.

Detailed descriptions given as to how the clock and apparatus were set up together with an excellent engraving showing the clock with the experiments taking place.

Thirty pages of charts giving precise details of the performance of the clock over the period of a month, readings of barometric pressure, temperature and humidity, and conclusions reached.

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Search terms: Pendulums, Precision Timekeeping
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Mr H. Ward's Compensation Pendulum

Catalogue no: 1499
Dewey No: Subject(s): Courtenay Ilbert Archive
Author(s): Henry Ward
Total pages: 12 Illustrations: 1 Language(s): English Publication date: 1808
Editor: Publisher: Society for the Encouragement of Arts, Manufactures and Commerce
Dimensions: 210mm x 130mm Condition: Good
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Full description and illustration (6 engravings) of a  form of zinc and iron compensation pendulum, for which the author received the Silver Medal of the Society for the year 1808.

Ward claims the advantage of his pendulum lies in the simplicity of its design and manufacture.

Final pages are a record with charts of the performance of the clock "...determined from observations of the Sun's Transit over the Meridian."

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Search terms: Pendulums, Precision Timekeeping
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Description of a Tubular Pendulum having All the Properties of the Gridiron but Being more compact as well as more steady in its Motions.

Catalogue no: 1497
Dewey No: Subject(s): Courtenay Ilbert Archive
Author(s): Edward Troughton
Total pages: 7 Illustrations: 1 Language(s): English Publication date: 1804
Editor: Publisher: Philosophical Journal?
Dimensions: 210mm x 130mm Condition: Reasonable
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A separately published offprint, in the form of a letter to Mr Nicholson, Author of the Philosophical Journal, originally published in that journal in December, 1804.

Although firstly a maker of telescopes and other astronomical instruments, the author describes how he has been making pendulums for twenty years, "...and I own the subject is still agreeable to me, being yet unencumbered with patents, the reason of which no doubt is, that the few wanted hold out no prospect of gain."

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Search terms: Pendulums, Precision Timekeeping
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On Isochronous Time-Keepers

Catalogue no: 1494
Dewey No: Subject(s): Courtenay Ilbert Archive
Author(s): Thomas Reid
Total pages: 3 Illustrations: 0 Language(s): English Publication date: 1815
Editor: Publisher: Philosophical Magazine and Journal
Dimensions: 230mm x 145mm Condition: Reasonable
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Notes:

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

A published letter in response to a letter from a Mr Tillock in a previous edition of this magazine (May 1815). 

Concerns the secure fixing and proper suspensions of pendulums with mention of John Ellicott clocks and those of Mr. De Lue.  A foot note describes the means by which a clock is brought to time at this period.

 

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Search terms: Pendulums, Precision Timekeeping
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Observations for proving the Going of Mr Elliott's Clock at St. Helena

Catalogue no: 1489
Dewey No: Subject(s): Courtenay Ilbert Archive
Author(s): Charles Mason
Total pages: 9 Illustrations: 0 Language(s): English Publication date: 1762
Editor: Publisher: Philosophical Transactions of the Royal Society
Dimensions: 220mm x 175mm Condition: Good
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Notes:

A report of the lecture given to the Society by Charles Mason on May 6th, 1762.

Concerns the clock taken to the Cape of Good Hope for observations and which was set up on St Helena on the journey back to Britain.  The Rev, Mr Maskelyne assisted with the observations.

Five pages of charts follow detailing the performance of the clock.

There follows "An Account of Mr Mason's Paper, concerning the Going of Mr Elliott's Clock, at St Helena: by James Short," read to the Society on May 13th, 1762.

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