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Specification of Joseph Eden MacDowall - Escapement for Timekeepers - No. 7874

Catalogue no: 1035
Dewey No: Subject(s): Patents
Author(s): Joseph Eden MacDowall
Total pages: 6 Illustrations: 2 fold out Language(s): English Publication date: 1838
Editor: Publisher: The Great Seal Patent Office
Dimensions: 290mm x 200mm Condition: Blue paper covers fragile. Some water damage to text pages.
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Notes:
Relates to; "An Improvement in the Manufacture of Escapaments for Chronometers, Clocks, and Watches". There are 13 drawings within the two fold out pages. The patent describes an escapement axis with a complete revolution for each impulse or, modified, two impulses for one revolution of the escapement axis. The purpose is to reduce the number of teeth normally used in an escape wheel so that it can be manufactured by persons of much less skill than is required for normal escapements. Malcolm Gardner, Horological Bookseller sticker on cover and first page.
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Specification of George Philcox - Chronometers, Watches and Other Timekeepers - No. 8145

Catalogue no: 1036
Dewey No: Subject(s): Patents
Author(s): George Philcox
Total pages: 4 Illustrations: 1 fold out Language(s): English Publication date: 1839
Editor: Publisher: The Great Seal Patent Office
Dimensions: 290mm x 200mm Condition: Blue paper cover fragile and torn
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Notes:
Relates to; "Certain Improvements in Chronometers, Watches, and other Timekeepers". The patent describes an escapement which Philcox names the "diamond lever" consisting of the, "novel arrangement, constuction, and adaptation of peculiarly formed levers or impelling and detant pieces by means of which I construct a more simple and less expensive escapement than those in present use." Reprint of 1857
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Specification of Robert Molyneux - Chronometers - No. 8418

Catalogue no: 1037
Dewey No: Subject(s): Patents
Author(s): Robert Molyneux
Total pages: 4 Illustrations: 1 fold out Language(s): English Publication date: 1840
Editor: Publisher: The Great Seal Patent Office
Dimensions: 290mm x 200mm Condition: Blue paper covers fragile
Related titles: The Marine Chronometer by R.T,Gould, p.181 Related library records:
Notes:
Relates to; "An Improvement or Improvements to Chronometers". Describes additional compensation to balances over and above the usual bi-metallic rim Reprint of 1856 Malcolm Gardner, Horological Bookseller sticker on cover and first page.
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Specification of John Gottlieb Ulrich - Chronometers - No. 7350

Catalogue no: 1032
Dewey No: Subject(s): Patents
Author(s): John Gottlieb Ulrich
Total pages: 10 Illustrations: 6 fold out Language(s): English Publication date: 1837
Editor: Publisher: The Great Seal Patent Office
Dimensions: 290mm x 200mm Condition: Paper covers and illustrations torn
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Notes:
Relates to "Certain Improvements in Chronometers". The patent describes six improvements as follows; An improved escapement designed to prevent stoppage from sudden shocks. A compensation device for the balance, another for the pedulum of an astronomical timekeeper, and the use of non magnetised material. A mechanism for stopping the hands of a watch without stopping the mechanism. A new method of locking and unlocking the striking parts of those chronometers that sound the time. A mechanism for releasing the striking parts of an alarm.
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Specification of Edward John Dent - Balance Springs for Timekeepers - No. 7067

Catalogue no: 1031
Dewey No: Subject(s): Patents
Author(s): Edward John Dent
Total pages: 3 Illustrations: None Language(s): English Publication date: 1836
Editor: Publisher: The Great Seal Patent Office
Dimensions: 290mm x 200mm Condition: Blue paper cover very fragile and worn
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Notes:
Relates to "An Improvement of the Balance Springs and their Adjustments of Chronometers and other Timekeepers". This patent describes the use of a flexible varnish that would protect the balance spring from rust but not affect its performance. Malcolm Gardner, Horological Bookseller sticker on cover and first page.
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Specification of Robert Westwood - Timekeepers - No. 5850

Catalogue no: 1030
Dewey No: Subject(s): Patents
Author(s): Robert Westwood
Total pages: 3 Illustrations: 1 Language(s): English Publication date: 1829
Editor: Publisher: The Great Seal Patent Office
Dimensions: 290mm x 200mm Condition: Blue paper cover fragile
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Notes:
Relating to; "Certain Improvements in Watches and Timekeepers". The patent describes a watch movement of 8 days duration with a going barrel of more than two thirds diameter of the movement itself. The other wheels of the train are mounted under the barrel in cavities in the pillar plate, between the pillar plate and the dial plate. Malcolm Gardner, Horological Bookseller sticker on cover and first page. Reprint of 1856
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Specification of John Gottlieb Ulrich - Chronometers - No. 5639

Catalogue no: 1029
Dewey No: Subject(s): Patents
Author(s): John Gottlieb Ulrich
Total pages: 5 Illustrations: 1 fold out Language(s): English Publication date: 1828
Editor: Publisher: The Great Seal Patent Office
Dimensions: 290mm x 200mm Condition: Blue paper cover fragile and torn
Related titles: See catalogue no. 1027 Related library records:
Notes:
Relating to, "Improvements in Chronometers". A further refinement of patent no. 5136 of 1825 (New Cat. No. 1027) Reprint of 1856
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Specification of Joseph Anthony Berrollas - Watches - No. 5489

Catalogue no: 1028
Dewey No: Subject(s): Patents
Author(s): Joseph Anthony Berrollas
Total pages: 8 Illustrations: 1 fold out Language(s): English Publication date: 1827
Editor: Publisher: The Great Seal Patent Office
Dimensions: 290mm x 200mm Condition: Blue paper cover fragile and torn
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Notes:
Relating to; "A detached Alarum Watch". The patent describes the alarm innovations as follows; "the new combination of machinery which I have produced in the detent and its appendages, the elevator, the propellor, and the locker in the watch movement and the combined operation of these with the locking lever and its wire tail" Reprint of 1857
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Specification of John Gottlieb Ulrich - Chronometers. No. 5136

Catalogue no: 1027
Dewey No: Subject(s): Patents
Author(s): John Gottlieb Ulrich
Total pages: 4 Illustrations: 1 fold out Language(s): English Publication date: 1825
Editor: Publisher: The Great Seal Patent Office
Dimensions: 290mm x 200mm Condition: Blue paper cover fragile and torn
Related titles: References in The Marine Chronometer,by R.T.Gould Related library records:
Notes:
Relating to, "Certain Improvements on Chronomters". The patent describes Ulrich's chronometer escapement, an example of which is in the BHI Museum Collection Reprint of 1857 R.T.Gould is critical of Ulrich's work, as follows; "His personal skill, perseverance and ingenuity, were of a high order, but he suffered from a persistent tendency to prefer a complicated mechanism to a simple one, and from an entire lack of business adroitness and prudence".
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Specification of George Prior - Chronometers - No. 4214

Catalogue no: 1022
Dewey No: Subject(s): Patents
Author(s): George Prior
Total pages: 4 Illustrations: 1 Language(s): English Publication date: 1818
Editor: Publisher: The Great Seal Patent Office
Dimensions: 290mm x 200mm Condition: Blue paper covers fragile
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Notes:
An invention , "For perfectly Detaching the Escape Wheel of Chronometers from the Influence of the Friction and Inaccuracies arising from the Main-Spring, the Pivots, and the Teeth, and all the other Wheels and Pinions in the Machine, during the Time of its giving Impulse to the Balance, whereby the Vibrations will be more accurately and uniformly supported than by any other Invention heretofore made public, which Invention will be much benefit and Utility for producing a superior Rate of Time-keeping." Malcolm Gardner, Horological Bookseller sticker on blue cover and first page.
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