HI. Smrd Bxpmmmti on the Mritm of bodies in 
Vacuo. M^de before the Roynl Society at Gre- 
fham College, by Mr Fr. Hauksbee^ K % S. 
A Defcription of the Machine for Gimng a Swift Motion to 
Bodies in Vacuo, without Admitting the Exterml Air^ 
reprefinted in Tab. IL Fig. I. 
A A. Is a Ladder, fuch as is generally usy in Houfes. 
• B. B. Is a Bar of Iron which pafles through the 
Middle of the upper Step, and is faften'd to the Back board 
ot the Ladder by 2 Nutts and Screws thro both the Board 
andiron, 
C. C The Jaws of the Iron Frame which holds the great 
Wheel D. D. 25 inches Diameter within its Groove* 
EvE. The Brafs Plate of the Air Pump on which the Re- 
cipient f. f. is placed. 
g. g. The Spindle to which Bodies of different Magni- 
tudes may be faften'd, by a hole paffing thro the Middle of 
them, fufficient to receive the Spindle ^ and by means of 
the 2 Nutts h. h* a larger or a fmaller Body may be fcrew'd 
fart between 'em. 
3. i. Is a Brafs Plate turned true to the Grownd Edge of the 
Recipient on which it is plac'd, having a Brafs Box in the 
middle of it, which is full of Collars of Leather well ovTd, 
thro which the Spindle paffes : The hole of the Brafs being 
likewife juft fit to. receive it. 
Hhhhhhhhhhhhh Lk. 
