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Heronis Automata.

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S Atis superque superiori libromihi videor scripsisse de Automa-tis mobilibus, idque facili &C tuta, neeusitata methodo. Nunc de Automatisstabilibus aliquid scribere institui &Cmelius & inusitatius, Sc ad doctrinamaccommodatius iis omnibus qua: re-licta sunt a majoribus; nec quicquamearum rerum a Philone Byzantinoscriptum inveni. Extat tamen sabulaquadam Nauplii, in qua dispositio-nes mulus sunt &: varia:, & appositetractaue; si tamen Palladis machinamexceperimus, in qua paulo plus ad-hibuit operis quam oportuit, cumabsque nova machina in tabulam in-duci potuisset, & postea siibduci: quo-niam poterat circumagendo siguramsuam circa cardines ejus pedibus sup-positis , eam sic inclinatam antea de-mittere, ut minime appareret, posteavero ope funiauli cujusdam erectamostendere, ac demum alterius funi-culi beneficio subducere. Adde quodpollicitus fulmine percussum Ajacem,

&: tonitrui strepitum auditum iri, fi-dem non liberavit. Siquidem perle-genti mihi multos ejus commenta-rios, nullus occurrit locus in quo per-scriptum id sit. Hic autem cuipiamfortasse videbimur de Philonis ope-ribus sic disputare, quasi eum argua-mus non potuisse promissum exsol-vere : verum aliter se res habet. Ete-nim fieri verisimiliter potest eum, cumquamplurima in dispositione sua pol-licitus esset, aliquid oblitum fuisse.Estenim facillimum vas aliquod globulisplumbeis plenum, & in ima parte per-foratum, idoneo tempore aperire, utglobuli in contentam &: densam pel-lem incidentes tonitrui strepitum imi- .tentur. Sic in theatris ubi opus est talisono, aperiuntur vasa referta ponde-ribus qua: in pelles quales in tympa-nis adhiberi solent aridas & tensas, utdictum est , lapsa strepitum edant.Quod attinet ad alia qua: in fabulaNauplii sigillarim tradidit, eorum &ordinem & methodum egregiam pro-bamus. Ideo solum ejus hac in re scri-pta redarguimus, quod existimave-rimus eos qui in locum hunc inci-dent, majorem utilitatem perceptu-ros, quando pulchre dicta ab anti-quis rite exponuntur, itemque autne-gligenter aut mendose scripta corri-