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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    [ » ] expanding or contracting according to the tempera- ture of the feafons. Fig. 2, reprefents the fame frame with a part of the apparatus annexed. A a ftrong brafs plate, to which the movement or maintaining power is con- nected by means of four pillars or dial feet. To the fame plate the moveable point of fufpenfion m is permanently fixed, between the chops of which the pendulum wire paffes, and in which it is fixed at pleafure by means of a fcrew compreffing them to- gether. To the fame plate is alfo fixed a fcale of degrees to meafure the arcs of vibration. T the fituation of the cord barrel ; H the pulley over which the line paffes to fufpend the weight or power W ; p h the brafs rule before defcribed. But the parts are fo much reduced to fhew their feveral relations or fituations upon the frame, that they are there- by rendered too minute to be well defined ; there- fore they are reprefented according to their real mag- nitudes in the following plate. Plate 11, fig. 2, reprefents the plate A before de- fcribed ; N the moveable point of fufpenfion, c c its chops, between the parts of which the pendulum wire pa lies