Royal Society

Account of experiments made with an invariable pendulum at the Royal Observatory at Greenwich, and at Port Bowen, on the eastern side of Prince Regent's Inlet

Catalogue no: 1520
Dewey No: Subject(s): Courtenay Ilbert Archive
Author(s): Henry Foster
Total pages: 70 Illustrations: 0 Language(s): English Publication date: 1826
Editor: Publisher: Royal Society
Dimensions: 270mm x 210mm Condition: Good
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An account of experiments to determine the acceleration of the Pendulum in different latitudes
Notes:

Pages extracted from the Philosophical Transactions of the Royal Society journal and bound separately between brown paper covers.

This account is one of several similar experiments around this date to record the performance of a pendulum clock and determine the length of a pendulum vibrating seconds at different latitudes.  Frequent reference is made to others who have worked in this field, eg. Captain Henry Keter ( who assisted with preparations for this experiment), Basil Hall, Sir Thomas Brisbane, Mr Goldingham and Captain Sabine.

Room location: Library Extension Cabinet: F Shelf: 5
Search terms: Pendulums, Precision Timekeeping
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An account of experiments to determine the acceleration of the Pendulum in different latitudes

Catalogue no: 1516
Dewey No: 681.1124 Subject(s): Courtenay Ilbert Archive
Author(s): Edward Sabine
Total pages: 27 Illustrations: 0 Language(s): English Publication date: 1821
Editor: Publisher: Royal Society
Dimensions: 270mm x 210mm Condition: Good
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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.
Notes:

A full account of the experiments using two clocks by Shelton, the same clocks used on Captain Cook's circumnavigation of the globe.

Clocks were set up in four different locations;

London 

Brassa (Shetland Islands)

Hare Island (Greenland)

Melville Island ("in the Polar Sea")

Thus the clocks were tested between latitudes 51.31 and 74.47 and the length of a pendulum vibrating seconds in each was recorded.

Two chronometers were also used in these tests; Arnold No.112 and Parkinson & Frodsham No. 259.

Room location: Library Extension Cabinet: F Shelf: 5
Search terms: Pendulums, Precision Timekeeping
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On the reduction to a vacuum of Captain Kater's convertable pendulum.

Catalogue no: 1515
Dewey No: Subject(s): Courtenay Ilbert Archive
Author(s): Edward Sabine
Total pages: 7 Illustrations: 0 Language(s): English Publication date: 1829
Editor: Publisher: Royal Society
Dimensions: 270mm x 210mm Condition: Reasonable
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The Resistance of the Air, determined from Captain Kater's Experiments on the Pendulum
Notes:

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

Paper gives details of experiments with a precision pendulum, on a clock by Dent.  Its performance is noted and conclusions drawn when in air of ordinary density and in highly rarefied air. 

Experiments took place April 21 - April 23, 1829.  Barometric pressure on these day noted.

Room location: Library Extension Cabinet: F Shelf: 5
Search terms: Pendulums, Precision Timekeeping
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An Account of the Influence which Two Pendulum Clocks Were observed to have upon each other

Catalogue no: 1514
Dewey No: 681.1124 ELL Subject(s): Courtenay Ilbert Archive
Author(s): John Ellicott
Total pages: 10 Illustrations: 0 Language(s): English Publication date: 1739
Editor: Publisher: Royal Society
Dimensions: 210mm x 270mm Condition: Reasonable
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Notes:

An account of an experiment with two pendulum controlled regulator timepieces by this eminent horologist.

Describes the two timepieces made to the highest standard (pendulum bobs 23 lbs, driving weights 3lbs), set up at right angles to each other, with pendulum bobs being two feet apart when at rest.  Behavior, rates, and stopping patterns of the clocks described.

Room location: Library Extension Cabinet: F Shelf: 5
Search terms: Pendulums, Precision Timekeeping
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