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12.8 Herodis Belopoeeca.

fuerunt, transversum quidem, & versatuperfacilem ; cujus extremitatibus qua-dratas sey talas apponentes,convertebant,e qua quidem conversione fiebat,ut Dios-tra, qua Arcus ipsius nervum distinet,adduceretur. Hoc autem sic, ex partibusenim Diostra, qua adChelonarium sunt,funes alligabant, easque ad jam dictumAxem referebant, quibus involutis, ipsaDiostra adductio efficiebatur. In majo-ribus autem, eo quod vis esset major, &brachiorum attractio operosior,Polyspas-to trahebant. Alligantes enim alterumejus manganum, Chelonario ; alterumvero ad syringa: summitatem ( qua: adAxem est, sive suculam) ductarium Po-lyspasti funem ad Axem referentes, con-volvebant, unde fiebat, adductionem fa-

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elliorem quidem esse, at tardiorem ; idifiquidem tarditatem facit quod plura Po-lyspasti membra sunt quae unico loco ad-volvuntur.

Fieri autem potest, ut Polyspastus ali-ter disponatur, nempe si ea qua: in alte-rum manganum sunt, trochlea:, chelo-nio aptentur, qua: vero in altero, syrin-ga: ejus, videlicet in parte inferiori, qua:est ad Axem. Ut autem non difficulter inmajoribus machinis Diostra conversa adcontrarias partes scytala, adducatur; itafiet,videlicet, si masculo securiclato subextremitate Diostra; ad partem nempeejus inferiorem, transversum Axem apta-bimus , &: prope ipsum Axem duos al-ligabimus funes, quorum extremitatesreferentes in superiori parte syringa perquasdam tro chelas, qua in extrema ejus

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