[ l6 3 3 
other, fo as to make together one Parallelopiped Body, 
of the common Length and Breadth of the feveral 
Bars, but of the Height of near 2 Inches, being the 
Sum of the refpedive Thickneffes of all the Bars 
taken together : And this Parallelopiped Body, being 
cramped with Brafs, and fitted with an Handle of the 
fame Metal, was armed at the 2 Ends that were made 
up of the common Extremities of all the Bars, with 
2 fubflantial Pieces of Iron, after the common man- 
ner of arming natural Loadflones, the whole Frame 
weighing together about 20 Troy Ounces. 
Bcfides thefe, the Prefident made alfo the follow- 
ing Report of fome Trials he had feen made at the 
fame time of the Effects of an Art Mr. Knight is 
.M after of, by which he can improve or increafe the 
lifting Powers of natural Loadflones. 
He carried with him, on IVednefday the 7th of 
November , a fmall armed Loadftone belonging to 
an Acquaintance, which weigh’d, with its Armour, 
7 Penyweight 14 Grains,* but which, being reputed 
but of an ungenerous Nature, took up, and with 
fome Difficulty, barely 2 Ounces. Mr. Knight took 
it into his Study, and, returning it in about a Minute, 
it then took up better than 4 Ounces with Eafe :But, 
upon his faying, it would flill gain fome more Strength, 
by remaining with him fome time, it was left till 
the 13 th, when it took up diflindly, with the fame 
Apparatus as before, 6 Ounces 18 Peny -weights 
and 3 Grains 5 fince which time it has alfo feveral 
times been found to lift nearly the fame Quantity. 
Mr. Knight further, at the fame time, fhew’d the 
Prefident the following Inflances of his Ability to 
invert 
