54 Polio

'g'aiitur autem universo inter se,in duobusgradibus,primis scilicet & ultimis,sintqueprimas quidem latiores secundis, quantaest: duorum canonum crassitudo, fecundas■vero tertiis,&: tertias quartis. Quod si mu-rus altior suerit, ita ut necestfe sit quatuor,aut etiam plures scalas compingere, com-ponentur hoc modo. Canones fecundasscalas immittuntur in spatium quod est in-ter canones primas, & loci duorum ulti-morum graduum prima: scalL aptanturlocis duorum ultimorum graduum secun-das, ut ferreis aut ligneis fibulis vincian-tur : scalarum autem summitates laminisferreis circumdentur a latere iri longitu-dinem, ne a foraminibus scindantur pras-gravatas, & utrimque compingantur at-que uniantur ; idque ubi sopius factumfuerit, longam efficiet scalam: cum ipsaautem scala primi, medii, & infimi gradusferreis laminis involuti clavis configan-tur. Componentur autem hoc modo. Ul-tima statuitur recta, & aptatur fecundas,unamque accipit fibulam. Juxta scalamstatuitur lignum altius, habens jugumquod quatuor funibus retinetur, ita ut re-ctum maneat. Hoc lignum proxime ad-stans, quando ad primam scalam trahitur,facile sequitur; & scala quas vincta est fi-bula in tantum attollitur, ut & illam re-ctam efficiat, atque ita alteram accipiatfibulam, & ex duabus scalis efficitur una.Similiter etiam tertia scala una fibula vin-citur, & opera ligni quod diaxylon vo-cant, attollitur, &: erigitur, & fecundamaccipit fibulam. Casterum ne vacillent insummo, quatuor funes accipiunt fecun-dum latitudinem, qui inclinationem ea-rum pro tempore sustineant. Quarta quo-que scala simili modo sequetur, si altitudomuri exegerit. Statuentur ergo quatuorscalas, perinde ac una recta. Primas au-tem scalas subjaceat trabs subrotunda,quas modiolis ac fibulis scalam recipiat:crassitudine semipedali aut duodecim di-gitorum , longitudine vero pedum quin-decim. Ab extremitatibus autem trabisfulcra circumposita cheloniis quas clavisconfixa sunt inclinentur ad perticas scahe,eam ne in alterutrum latus vacillet reti-nentia. Huic ligno paxilli bini utrimqueterras infigantur, ut scalam quas vertiturinclinare possint, ne in prasceps trahatur.Stabunt porro milites in scalis, & oblataoccasione omnes simul scalas inclinabun-tur,ac repentino impetu hostes expellent.Infra vero retrorsus funes laxantur, ma-chinis quibusdam intensi, utsiacriorfue-rit conflictus, scalas retrahant ex muro,quas fumum opera eriguntur & attollun-tur.

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