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V. Account of Dr. Knight’s Method of making artificial 
Load/lones. By Mr. Benjamin Wilfon, F. R. S. 
TO JOSEPH BANKS, ESQ; P. R. S. 
SIR, 
Read Dec. 17, r i ^HE method of making artificial load- 
■*“ ftones, as it was difcovered and prac- 
ticed by the late Dr. gowin knight, being unknown 
to the public; and I myfelf having been frequently pre- 
fent when the doctor was employed in the moil: material 
fteps of that curious procefs, I thought a communication 
thereof would be agreeable to you and the philofophic 
world. 
The method was this : having provided himfelf with 
a large quantity of clean filings of iron, he put them into 
a large tub that was more than one-third filled with clean 
water : he then, with great labour, worked the tub to and 
fro for many hours together, that the friction between 
the grains of iron by this treatment might break off fuch 
H a fmaller 
