Salusbury, Thomas, Mathematical collections and translations (Tome I), 1667

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1ſuppoſing it's Centre at O by which it is ſuſtained to be no more
but an indiviſible Point, like as I have ſuppoſed here for the Leaver,
if the Armes be declined one way or the other, that which ſhall be
the lowermoſt ought evermore to be adjudged the heavier; ſo that
the Centre of Gravity is not ſixed and immoveable in each ſeveral
Body, as the Ancients have ſuppoſed, which no perſon, that I
know of, hath hitherto obſerved.
But theſe laſt Conſiderations are of no moment in Practice, and
it would be good for thoſe who ſet themſelves to invent new
Machines, that they knew nothing more of this buſi­
neſſe than this little which I have now writ thereof,
for then they would not be in danger of decei­
ving themſelves in their Computation,
as they frequently do in ſuppoſing
other Principles.
215[Figure 215]

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