( 246 ) 
Loadftones*, that is, as their Surfaces. Upon this 
Principle the Tables are formed. Th’e firft Column of 
thcfe Tables is in common to the four following, and 
helps to (hew how many times its Weight any Load- 
ftone fuftains. 
In the fecond, third, fourth and fifth Columns, are 
the Weights of Loadftones in different Denominations. 
The fecond,entituled Grains, reaches Grain by Grain to 
' 4S0 Grains, or one Ounce, and will ferve for any Load- 
ftone, whofe Weight does not exceed one Ounce. 
The third reaches, by Penny- weights, up to two 
Pounds, or 480 Penny- weights, and therefore ferves 
for any Stone that weighs not lefs than one Penny- 
weight, nor more than two Pound. The fourth 
Column reaches, by Ounces, up to forty Pounds, or 
480 Ounces, and therefore will ferve for any Stone 
not exceeding that Weight. The fifth ferves from 
one to 480 Pounds. The fixth Column entkuled. 
Weight iuftained, is in common to the four preced- 
ing ; and the Numbers in this Table, if they were 
divided by 10, would be the Squares of the Cube 
Roots of the Numbers in natural Order, from 
I to 480, as they are found in the Column of 
Pounds. But thefe Squares of the Cube Roots are 
here multiplied by ten, becaufe a Loadftone of the 
very worft Sort, if it weighs but one Grain, will fu- 
ftain ten Grains , and fo thefe Tables, by fimple In- 
fpeftion, fhew what Number of Grains any Loadftone 
of that worft Charader would fuftain, if the Stone 
weigh not more than 480 Grains, or one Ounce. 
The Numbers in the firft Column entituled. How often 
its Weight, are proportional to the Reciprocals of the 
Cube Roots of the natural Numbers, and are form’d 
by dividing the Numbers of the fixth Column, by 
