Remarks on a pamphlet [respecting H.'s chronometer] lately published by the Rev. Mr. Maskelyne, under the authority of the Board of Longitude / By John Harrison.

  • John Harrison
Date:
1767
Catalogue details

Licence: Public Domain Mark

Credit: Remarks on a pamphlet [respecting H.'s chronometer] lately published by the Rev. Mr. Maskelyne, under the authority of the Board of Longitude / By John Harrison. Source: Wellcome Collection.

    12/36 (page 10)
    [ *° ] €t caufc of thefe irregularities, as well as <c of the Watch's going fo much flower in *c the Month of January, than it had gone <c before. Mr. Majkelyne ought along, with this, to have publiihed what I told him when I explained it; that the Provifion againft the effeds of Heat and Cold was not in this Machine extended to all De¬ grees; that I never had tryed it fo low as the freezing Point, which according to the bed Informations I have been able to pro¬ cure is a Degree of Cold that never did exifl between the Decks of a Ship at Sea, in any Cli¬ mate yet explored by Mankind* Mr. Mafkelyne then comes to the Rate of its going in different Portions; and fays, It is obvious, thefe laft-mentioned Trials cc of the Watch in a vertical Pofition could not be defigned to fhew how near it would “ go at Sea, where it can never obtain thefe f 6 Portions: the Intent of them is to prove u how near Mr. Harrifons Execution of te his Watch comes up to his Principles, *e with refped to the making all the Arcs deferibed by the balance, whether large “ or fmall, to be performed in the fame Time, as Mr. Harrifon afferts them to *' be. Mr. Maskelyne here alfo might have had Candour enough to inform the Public, as I did him, that although the Watch was quite fufficient to anfwer the Purpofes re¬ quired of it in Navigation, and to fulfil what was preferibed by the Ad of Queen Anne, yet it was far from being in a date of Per fed ion, as an univerfal exatt Time- Keeper for