Stevin, Simon
,
Mathematicorum hypomnematum... : T. 4: De Statica : cum appendice et additamentis
,
1605
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*DE* S*TATICÆ PRINCIPIIS*.
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<
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xml:space
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<
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gulum eſto. </
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<
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in-
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veniendum eſt.</
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<
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xml:space
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<
s
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xml:space
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">Quadrangulum rectâ A C in duo triangulaſecto ipſorum
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gravitatis centra, 3 propoſ. </
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<
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">adjumento, inveniuntor. </
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<
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guli A B C, eſto E; </
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<
s
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">recta denique E F jugum. </
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<
s
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xml:space
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">quo facto D G,
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B H perpendiculares ducuntor in A C. </
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<
s
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xml:space
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">jugo F E, ſecto in I, ut radius I E, ſit
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ad radium I F, quemadmodum D G ad B H; </
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<
s
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xml:space
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">I gravitatis centrum eſſe dico.</
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<
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xml:space
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</
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</
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<
head
xml:id
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xml:space
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preserve
">5 Exemplum.</
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<
s
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xml:space
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<
s
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xml:space
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">ABCDE quinquangulum inordinatum eſto.</
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</
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<
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<
s
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">Q*VAESITVM*. </
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<
s
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xml:space
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">Gravitatis centrum inveniendum eſt.</
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<
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<
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xml:space
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">PRAGMATIA.</
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s
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xml:space
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">Quinquangulo duabus diagoniis AC, AD in tria triangula reſoluto, qua-
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dranguli A C D E gravitatis centrum F per 4 propoſ. </
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<
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<
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number
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guli A C B, G per 3 propoſ. </
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<
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gum F G; </
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<
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xml:space
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">tum B G in A C, CI & </
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<
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xml:space
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">E K in A D perpendicu-
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lares ſunto, & </
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<
s
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xml:space
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">tribus rectis A D, A C, H B in eadem analogia
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quarta inveniatur LM, deniqueſecato jugum F G in N ut
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ratio ſegmentorum GN, NF eadem ſit quæ C I & </
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<
s
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xml:space
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">E K ad
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ipſam L M. </
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<
s
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xml:space
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</
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<
head
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xml:space
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">6 Exemplum.</
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<
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<
s
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xml:space
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">D*ATVM*. </
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<
s
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xml:space
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">ABCDEF inordinatum ſexangulum eſto.</
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<
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</
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<
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<
s
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">Q*VAESITVM*. </
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<
s
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xml:space
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">Gravitatis centrum inveniendum eſt.</
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<
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</
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</
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<
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<
head
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xml:space
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preserve
">PRAGMATIA.</
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<
p
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<
s
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xml:space
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">Sexangulum tribus diagoniis in quatuor triangula dirimito, & </
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<
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lorum ADCB, ADEF gravitatis centra G, H per 4 propoſ. </
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<
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xml:space
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">invenito, quæ
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connectat jugum GH. </
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<
s
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xml:space
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">deinde in AC perpendiculares
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demittuntor BI, DK. </
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<
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<
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tribus rectis quarum prima F D ſecunda AC, tertia
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compoſita ex BI & </
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<
s
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xml:space
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quartam N O, tumq́ue jugum H G ſecato in P ut ratio
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ſegmentorũ G P, P H eadem ſit quæ compoſitæ ex A L
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& </
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<
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<
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tatis centrum. </
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<
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xml:space
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<
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<
s
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">In primo exemplo eſtradius N E ad radium N F, ſicut H I ad H L, at ſic
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quoque eſt parallelogrammum ut G H I K ad parallelogrammum G H L M;
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</
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<
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<
s
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xml:space
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">æqueordinatè ut G H I K ad G H L M, hoc eſt per conſtructionem triangu-
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lum A C D ad triangulum A C B ſicut N E ad N F. </
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<
s
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xml:space
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(per primam 1 lib. </
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<
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">propoſitionem) eſt expoſiti quadranguli gravitatis cen-
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trum. </
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<
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