An attempt toward obtaining invariable measures of length, capacity, and weight, from the mensuration of time / [John Whitehurst].

  • John Whitehurst
Date:
1792?]
Catalogue details

Licence: Public Domain Mark

Credit: An attempt toward obtaining invariable measures of length, capacity, and weight, from the mensuration of time / [John Whitehurst]. Source: Wellcome Collection.

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    [ <5 ] pen fate for the refiftance of the medium, and which may neither accelerate nor retard the vibrations; but the poffibility of fuch an application as will effectually anfwer thofe important purpofes, has been much doubt- ed ; therefore, as fuch opinions, however erroneous, may poffibly prejudice the minds of many againft the accuracy of fuch experiments, and as the propofition afferted is rather to be demonftrated by experiment than by reafon ; provifion is made in the conftruCtioa of the apparatus, whereby the truth or fallacy of fuch conjedtures may be truly ascertained. And in order to {hew whether the plan adopted i capable of being reduced to general praCtice, the movement or maintaining power is not made effential- ly different from that of a common eight-day clock, nor is it executed with more than common care, pre- fuming that if the refult of the experiments depended upon too much accuracy in the executive part of the apparatus, the plan would be the lefs generally ufeful. Therefore the train confifts of the ufual number of wheels and pinions, containing the ufual number of teeth, the fir ft pinion excepted, being No. 12, as a means of rendering the impetus on the pendulum ra- ther * I