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    Remarks on a Pamphlet Lately published by the Rev. Mr. Maskelyne, Under the Authority of the Board of Longitude
    Remarks on a Pamphlet Lately published by the Rev. Mr. Maskelyne, Under the Authority of the Board of Longitude
    Remarks on a Pamphlet Lately published by the Rev. Mr. Maskelyne, Under the Authority of the Board of Longitude
    Ebook51 pages42 minutes

    Remarks on a Pamphlet Lately published by the Rev. Mr. Maskelyne, Under the Authority of the Board of Longitude

    By John Harrison

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    LanguageEnglish
    PublisherArchive Classics
    Release dateNov 26, 2013
    Remarks on a Pamphlet Lately published by the Rev. Mr. Maskelyne, Under the Authority of the Board of Longitude
    Author

    John Harrison

    John Harrison is Yorkshire born and bred. His work draws inspiration from his beloved county and is known for portraying built structures in the wider landscape, exploring the contrast between the manmade and the natural.

    Read more from John Harrison

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      Book preview

      Remarks on a Pamphlet Lately published by the Rev. Mr. Maskelyne, Under the Authority of the Board of Longitude - John Harrison

      The Project Gutenberg EBook of Remarks on a Pamphlet Lately published by

      the Rev. Mr. Maskelyne, Under the Authority of the Board of Longitude,

      by John Harrison

      This eBook is for the use of anyone anywhere at no cost and with

      almost no restrictions whatsoever. You may copy it, give it away or

      re-use it under the terms of the Project Gutenberg License included

      with this eBook or online at www.gutenberg.org

      Title: Remarks on a Pamphlet Lately published by the Rev. Mr. Maskelyne,

      Under the Authority of the Board of Longitude

      Author: John Harrison

      Release Date: September 5, 2011 [EBook #37321]

      Language: English

      *** START OF THIS PROJECT GUTENBERG EBOOK REMARKS ON A PAMPHLET ***

      Produced by Markus Brenner and the Online Distributed

      Proofreading Team at http://www.pgdp.net

      REMARKS

      ON A

      PAMPHLET

      Lately published by the

      Rev. Mr. MASKELYNE,

      Under the

      Authority

      of the

      BOARD OF LONGITUDE.

      By JOHN HARRISON.

      The Second Edition.

      LONDON:

      Printed for W. Sandby in Fleetstreet.

      MDCCLXVII.

      (PRICE SIXPENCE.)

      REMARKS,

      ON A

      PAMPHLET, &c.

      A  Publication having lately been made by the Rev. Mr. Maskelyne Astronomer Royal, under the Authority of the Board of Longitude, manifestly tending, by the Suppression of some Facts and the Misrepresentation of others, to impress the World with an unjust Opinion of my Invention, and falsely asserting that my Watch did not at certain Periods therein mentioned keep Time with sufficient Exactness to determine the Longitude within the Limits prescribed by the Act of the 12th of Queen Anne ; I think it incumbent upon me to submit some Observations thereon to the impartial Publick; and the rather, because the said Pamphlet is rendered so confused by unnecessary Repetitions, and voluminous Tables, that a Man must be pretty conversant in these Matters, to trace and combine the Facts, so as to check the Conclusions, which would consequently be taken upon Trust by the generality of Readers, unless publickly contradicted. As it will be my Endeavour so far to avoid the Use of all Terms of Art as to make the Subject generally intelligible, I flatter myself I shall not be thought impertinent for giving a short Explanation (though quite unnecessary to the far greater Part of my Readers) of what the Longitude is, and what the Service required of the Watch.

      The Longitude of any Place is its Distance East or West from any other given Place; and what we want is a Method of finding out at Sea, how far we are got to the Eastward or Westward of the place we sailed from. The Application of a Time-Keeper to this Discovery is founded upon the following Principles: The Earth’s Surface is divided into 360 equal Parts (by imaginary Lines drawn from North to South) which are called Degrees of Longitude; and it’s daily Revolution Eastward round it’s own Axis is performed in 24 Hours; consequently in that Period, each of those imaginary Lines or Degrees, becomes successively opposite to the Sun (which makes the Noon or precise Middle of the Day at each of those Degrees); and it must follow, that from the Time any one of those Lines passes the Sun, till the next passes, must be just four Minutes, for 24 Hours being divided by 360 will give that Quantity; so that for every Degree of Longitude we sail Westward, it will be Noon with us four Minutes the later, and for every Degree Eastward four Minutes the sooner, and so in Proportion for any greater or less Quantity. Now, the

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