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Pendulums. An Attempt Towards Obtaining Invariable Measures of Length, Capacity, and Weight, from the Mensuration of Time, Independant of the Mechanical Operations Requisite to Ascertain the Center of Oscillation, or The True Length of Pendulums

Catalogue no: 1518
Dewey No: 681.1124 Subject(s): Courtenay Ilbert Archive
Author(s): John Whitehurst
Total pages: 46 Illustrations: 3 Language(s): English Publication date: 1787
Editor: Publisher: The Author
Dimensions: 260mm x 210mm Condition: Good
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An account of experiments to determine the acceleration of the Pendulum in different latitudes
Notes:

Pamphlet now bound between red hard covers.

The introduction explains the purpose of the experiments with reference to the work of others before the Author.

In the main text, the apparatus designed and used for the experiments is explained and illustrated with three excellent pull-out engravings.

Several charts of results included.

Room location: Library Cabinet: E Shelf: 2
Search terms: Pendulums, Precision Timekeeping
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Dent on The Dipleidoscope; or, Double-Reflecting Meridian and Altitude Instrument

Catalogue no: 1466
Dewey No: Subject(s): Courtenay Ilbert Archive
Author(s): E.J.Dent
Total pages: 24 Illustrations: 8 Language(s): English Publication date: 1853
Editor: Publisher: The Author
Dimensions: 215mm x 140mm Condition: Generally good, cover a bit fragile
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Notes:

Later edition and virtually identical to Cat. No. 1465.

A few additional paragraphs added to the 1843 version plus an extended table of "Mean Time of the Sun's Semidiameter Passing the Meridian".

Includes Equation of Time Table for 1854.

Room location: Library Extension Cabinet: F Shelf: 5
Search terms: Sundials
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Dent on The Dipleidoscope; or, Double-Reflecting Meridian and Altitude Instrument

Catalogue no: 1465
Dewey No: Subject(s): Courtenay Ilbert Archive
Author(s): E.J.Dent
Total pages: 24 Illustrations: 8 Language(s): English Publication date: 1843
Editor: Publisher: The Author
Dimensions: 215mm x 140mm Condition: Generally good, cover stained with some tears
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Notes:

A pamphlet describing the principles, origins, installation and instructions on the use of the Dipleidoscope as invented and patented by J.M.Bloxham and manufactured by E.J.Dent.

Final pages consist of two charts; the first, "Dent's Approximate Table of Longitudes in Time," the second, "Dent's Table for the Equation of Time, 1843," the third, "Mean Time of the Sun's Semi-Diameter Passing the Meridian."

Room location: Library Extension Cabinet: F Shelf: 5
Search terms: Sundials
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Definitive Method of Calculating, Sizing, or Proportioning the Diameters or Semidiameters of Wheels Which Are Intended To Turn Each Other By Teeth

Catalogue no: 1464
Dewey No: Subject(s): Courtenay Ilbert Archive
Author(s): Joseph Brewer
Total pages: 62 Illustrations: 0 Language(s): English Publication date: 1816
Editor: Publisher: The Author
Dimensions: 220mm x 150mm Condition: Good, slight staining
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Notes:

Includes, "Tables for Proportioning the Diameters of Wheels, in Clock or Watch-Work, Mill-Work. and Other Kinds of Machinery, with Remarks, &c."

Printed by J. Wilcockson, Chronicle-Office, Market-Place, Preston.

A few pages cover the general principles of toothed gears (spelled geers), "to shew the method of calculating, sizing, or proportioning the diameters or semidiameters of wheels that are to work together in clock or watch work, millwright work, or other machinery; which is equally applicable to spur, mitre, or bevel geers, ...".

Room location: Library Extension Cabinet: F Shelf: 5
Search terms: Related Subjects
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