Harriot, Thomas, Mss. 6782

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732366
De
[Translation: On ]
If the The line ab by his revolution
cometh at length to be parallel to
the infinite line bf
Which
motion being from b to g suppose
to have been
The
degree of the motion let be
mn. the time op
The beginning of the time or first instant o.
The last instant wherein the line is
parallel, p. Now seing that ab must cut at
an infinite distance & that his last cutting must be
before the instant p
Which suppose q That q as it is argued by the premises
must differe from p by an indivisible time, so that it q must be the next instant
to p. & no other
In which instant q, ab must not be parallel but
make his last cutting at an infinite
And therefore it must have
a certayne situs at that instant out of the point g towards b, which let be af,
as it maketh his last
In which situation the motion ordering it hath
the sayd degree mn, as in all other
From the which situation to the situation
of being parallel it must be moved unto (as it is sayd) in the next
Now suppose (as it may be) that the motion from b to g be in half the time
of op
Then doth it follow necessarily that the degree of motion or velo-
city be double to mn. And therefore, what space or parte of a space, (be it
finite or infinite, so it be positive,) it moved before according to
the degree of mn. it moveth the same now, in half the time.
Therefore in this second motion when ab cometh to have his situation
at af to make the sayd last section; seing that then it hath double
degree of velocity; it must afterward be parallel in half an instant
that is to say, that in half that time which was sayd to be indivisible.
Which doth imply
Agayne if it be sayd that af at that & in the position (when &
where it maketh his last section with bf before it be then
be deinceps to ah. or that the poynts f & h deinceps at an infinite
distance so that no point can be
Yet from the poynt k to f may
be interposed a line kf. and also from l to f. & by the doctrine of Elements
the angle fkh, or flh must greater lesser than fah. & therefore lesse than that
which was sayd to be least or indivisible. & therefore the lines af & ah, or the
poynts f & h be not deinceps. quæ implicant

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