Page:Philosophical Transactions - Volume 024.djvu/707

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III. Several Experiments on the Attrition of Bodies in Vacuo. Made before the Royal Society at Gresham College, by Mr Fr. Hauksbee, F. R. S.
A Description of the Machine for Giving a Swift Motion to Bodies in Vacuo, without Admitting the External Air represented in Tab. II. Fig. 1.

A. A. Is a Ladder, such as is generally us'd in Houses. B. B. Is a Bar of Iron which passes through the Middle of the upper Step, and is fasten'd to the Back-board of the Ladder by 2 Nutts and Screws thro both the Board and Iron.

C. C. The Jaws of the Iron Frame which holds the great Wheel. D. D. 23 inches Diameter within its Groove.

E. E. The Brass Plate of the Air Pump on which the Recipient f. f. is placed.

g. g. The Spindle to which Bodies of different Magnitudes may be fasten'd, by a hole passing thro the Middle of them, sufficient to receive the Spindle; and by means of the 2 Nutts h. h. a larger or a smaller Body may be screw'd fast between 'em.

i. i. Is a Brass Plate turn'd true to the Grownd Edge of the Recipient on which it is plac'd, having a Brass Box in the middle of it, which is full of Collars of Leather well oyl'd, thro which the Spindle passes: The hole of the Brass being likewise just fit to receive it.

k. k.

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