I, Part of a Letter from Mr. Wm. Arderon, 
F. R. S. to Mr. Baker, F. R. S. containing a 
Defcription of a Water-Wheel for Mills in- 
vented by Mr. Philip Williams. With an 
Extract of a Letter from the Rev. Dr. 
Samuel Salter to Mr. Arderon, concerning 
the Bark preventing catching Cold, 
Norw:eh t May 30, 1745c 
SIR. 
Read at a Meeting 
ef the Royal Society, 
Jan. 9. 174S-6. 
M 
R. Philip Williams, chief 
Engineer to our Water- 
works at Norwich, a Matt 
of great Ingenuity, who, in his Time, has been 
Author of many curious Inventions, has contrived 
lately a Machine for the Railing of Water to fupply 
Cities, drain marlhy Grounds, or other ufeful Pur- 
pofes, where no Head of Water can be procured* 
and the Current runs very flowly : Circuaiftances 
which render molt other Engines ufelefs. 
With his Leave, I now fend you a Drawing of 
this Machine (Tab. I. Fig. i.) which Ifhall endekyour 
to explain in a Manner to be underftood. 
The Axis of the firft Mover is cut into the Form 
of an hexanguiar Prifm, of Dimenfions fuitable to 
the Force requir’d, as is reprefentcd by the Letter A 
Into this, feveral Sets of Holes are mortifed, as 
BBB. Thefe are intended to receive different 
Sets of Sails made of iron Plates, one whereof is 
reprefented atC,- all which Sails are weathered in the 
A fame 
