Stevin, Simon, Mathematicorum hypomnematum... : T. 4: De Statica : cum appendice et additamentis, 1605

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133133*DE* H*YDROSTATICES ELEMENTIS*.
2 Exemplum.
D*ATUM*. Parallelogrammum obliquangulum
188[Figure 188] A B C D horizonti perpendiculare, huic moles aquea
ponderis 18 pedum incumbit, ejusq́ue ſummi lateris
A B in aquæ extima ſuperficie longitudo ignoratur;
at-
qui perpendicularis A E in baſin imam D C datur
pedum.
Q*VAESITVM*. Invenire latus A B.
CONSTRVCTIO.
18 per quadratum A E 3 diviſis, quotique 2 duplum erit 4 pro A B.
3 Exemplum.
D*ATVM*. Rectangulum parallelogrammum
189[Figure 189] A B C D horizonti obliquum, cui inſidet moles
aquea pondere pedum 36, ejusq́ue latus ſupremum
in aquæ ſuperficie ſumma longitudinis ſit ignotæ
ſed latus A D 4, &
perpendicularis A E à ſummo
latere in planum per latus imum horizonti paralle-
lum, 3 pedum dantur.
Q*VAESITVM*. Invenire latus A B.
CONSTRVCTIO.
Planus ab A E 3 in A D 4 eſt 12, per quem diviſis 36 quotoque 3 duplicato
ſit A B pedum 6.
4 Exemplum.
D*ATVM*. A B C D parallelogrammum obli-
190[Figure 190] quangulum ad horizontem obliquatum, cui inſi-
det moles aquea ponderis 36 pedum, ejusq́ue ſu-
premum latus A B in aquæ ſumma ſuperficie, lon.
gitudinis ſit ignotæ; ſed A E perpendicularis à
ſummo latere in imum pedum 4, &
altera indidem
in planum per imum latus horizonti parallelum
ſit pedum 3.
Q*VAESITVM*. Invenire latus A B.
CONSTRVCTIO.
Planus ab A F 3 in A E 4 eſt 12, qui dividens 36, dabit quotum 3, isq́ue
duplicatus facit A B 6 pedum.
DEMONSTRATIO.
Si in primo exemplo latus A B majus minusvé eſſet 4 pedibus, pondus item
aqueum ipſi inſidens majus minusvé eſſet pedibus 18, quod theſi repugnat.
quare A B eſt pedum 4. REliquorum exemplorum demonſtratio huic eſt ger-
mana.
C*ONCLVSIO*. Itaque ſi parallelogrammi ad horizontem incli-
nati, &
c.

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