( )■ 
Stone of eqUril Gobdnefs with this would fuftain, let 
its Weight be lefs or more, provided it does not exceed 
one Ounce, or 480 Grains. For looking into the fe* 
cond Column for the Weight of the Stone, and having 
found againft it, in the (ixth Column, the Weight 
fuftained by a bad Stone, if you multiply the Quo* 
tient above found, which fhews the Charader of Good- 
nefs, by the Number in the Tables exprefling the 
Weight fuftained, itheProdudis the Number of Grains 
this particular Stone willfuftain. 
If a Stone of the fame Chara’der weighs more than 
one Ounce, or 480 Grains, and lefs than two Pound, 
to know what Weight this will fuftain, the Compu- 
tation muft be transferred from the Column of Grains 
to. that of Penny-weights. Now fince one Penny- 
weight is equal to twenty, four Grains, and the Weight 
fuftained is to be exprefted, not in Grains, but in Penny- 
weights, the former Number, which gives the Cha- 
rader of Goodnefs of the Stone for Grains, muft be 
altered, to do the fame thing for Penny- weights. 
Multiplying therefore this Number by the Recipro- 
cal of the Cube Root of 24, the Number of Grains 
contained in one Penny- weight (and the Numbers in 
the Tables are formed accordingly) the Produd gives 
the Number (hewing the Charader of Goodnefs in 
this Stone, which being found, the remaining Part 
of the Operation is the fame as in the former. 
If a Loadftone exceeds 480 Penny-weights, and 
is lefs than forty Pound, we muft in like manner find 
the Number of the Stone for Ounces; which may be 
done either by the Number already found for Grains, 
multiplying it by the Number againft Unit in the 
Table from Grains to Penny- weights, or by the Num- 
ber for Penny- weights, multiplying it by the Num- 
