Harriot, Thomas - Mss. 6787

752377

6.) De parabola
casus. 4.
In isto casu

b t = u c

[Translation: 6) On the parabola.
Case 4. In this case

b t = u c

Casus. 5.
ubi

h

k

; puncta
sunt inter

d

a

: non describitur;
neque opus est; an
facile intelligitur.
nam stante angulo

b a c

, summatur punctum

s

inter

b t

. Et fiat

u c - b s

.
et ita habeatur
tria puncta

a

b

c

,
pro isto
[Translation: Where the points

h

k

are between

d

and

a

. It is not described and there is no need, for it is easily understood. For instead of the angle

b a c

, take the point

s

between

b

and

t

. And take

u c - b s

and thus there will three points

a

b

c

, for this case.

Sunt alij casus
vide chartus de
parabola. b.) in dorso.
[Translation: There are other cases, see the back of the sheet on the parabola ]