. De re ichnographica : cujus hodierna praxis exponitur, et propriis exemplis pluribus illustratur : inque varias, quae contingere possunt, ejusdem aberrationes, posito quoque calculo, inquiritur . «D Jlll. triangulo acutangulo, vel erroneo cd in obtufangulo. [npriore cafu , ob angulos CEm, cDnacutos, erunc dein-ceps contigui ceb, cDBobtufi; at in pofteriore, anguliceb, cdb ambo reclijquareinutroque horum cafuurnangulus CEB(fig. l\)major erit acuto ebc, &aliuscDB(fig. 2\)major acutoalio CBDjideo latus verum cb erroneo c e ( fig. i\ ) majusque alio erroneo c d () Vel normalis cm,
. De re ichnographica : cujus hodierna praxis exponitur, et propriis exemplis pluribus illustratur : inque varias, quae contingere possunt, ejusdem aberrationes, posito quoque calculo, inquiritur . «D Jlll. triangulo acutangulo, vel erroneo cd in obtufangulo. [npriore cafu , ob angulos CEm, cDnacutos, erunc dein-ceps contigui ceb, cDBobtufi; at in pofteriore, anguliceb, cdb ambo reclijquareinutroque horum cafuurnangulus CEB(fig. l\)major erit acuto ebc, &aliuscDB(fig. 2\)major acutoalio CBDjideo latus verum cb erroneo c e ( fig. i\ ) majusque alio erroneo c d () Vel normalis cm, vi Aberrationis in defe&um, cadetinterlatus verum CB,&erroneum CE,autalia cn, aber-rando in exceflum, cadet inter verum latus cb, & 3rro-neumcD,qux utrinque in unoquoquecafu fient paria,ficontingat, angulum bce aut bcd ab alterutra normaliumbifariam fecari. Si denique normalium alterutra, vel utra-que magis diftabit ab erroneis lateribus, angulo acuto adb oppofitis, eorum utrumque longius erit vero cb j fem-perautem brevius erroneo alio cd, velc e, quorum utrum-que opponitur angulo ad b obtufb. Angulus enim d c e ( fig. i\ ) duplus unius b c e , veibcd, femper inaequaliter dirimitur
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