* Distansdimidiocubito &sexta par-te cubiti acommijfio-»/.

48 Polio

in nucibus implicationes vulgo vocanturpolyspasta. Post rhostacem vero defigiturscala supra rectas trabes a * dimidio cubi-to commissionis trabis posterioris trans-verse; furgens usque ad medium jugumrhostacis, habetque juga quidem conti-nentia tria, sustinentia vero sex. In me-dio autem istorum foramina fiunt ligneo-rum graduum, per qua: funis transiens a-lios gradus essicit, firmiorem reddens sca-lam. Hic funis incipit quidem a primo fo-ramine superno, desinit vero in ultimo fo-ramine, & inducitur in alia foramina quLsunt in extremitate basis hujus fcase re-ligatus in trabibus. S ursum vero scala inangustum conducta, in unum cubitumconsummatur. In summa autem extremi-tate scase sursum duo fiunt foramina,quibus immittitur funis qui laxe admo-dum circumvolvitur super rhostacem, itaut &: scalam retineat, nec rhostacis incli-nationes impediat.

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