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tacex, ferreis laminis vinctx a fundo,fo-ramine digitali. Hx apertx implenturminuto carbone: habentque fistulam fer-ream, cui alia fistula inseritur, habens la-tres. Cxterum carbo ignem concipiensaccenditur flabello, eamdemque plagaminfert quam flamma, & in lapidem as-cendit : foditur autem murus infuso ace-to, aut alio quovis liquore acri. Figuravero talis est, qualis hic subjicitur. Utun-tur porro illa plumbarii.

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Si turrem,aut portam, aut murum a-riete quassare voluerimus, facienda erunttestudines arietaria; subrotata; excelsa;,qua; suspensionem arietis portent, ut a-rietis ictus violentior sit: nam cum excel-sum fuerit sustentaculum, majus spatiumattrahit aries, &: ex longo intervallo il-latus fortius ferit. Sit autem testudo spe-cie dumtaxat excelsa atque magna, quofacile ducatur: sitque duplo altior quamlatior, ut spinam habeat acutam. Lati-tudines autem sint minus recta;, ut pon-dera qua; injiciuntur non solum deci-dant , verum etiam longius repellantur.Vergens autem in murum habeat oper-culum ^ prxtenfum, ut pondera qua; inarietem conjiciuntur excipiat, & in u-trumque latus depellat. Jaciuntur enimtum lapides perforati tamquam torques,tum ligna obliqua veluti juga xqualiteremissa, ut omnino opus suum perficiant,& impetum in murum retrahendo prx-veniant. Itaque aut aries confringitur,aut ii qui arietem impellunt interimun-tur. Constructio autem testudinis est hu-jusmodi. Duo juga constituuntur a fe

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