(*) the Roman palm used here is probably not the Ancient Roman palmus (minor), but the 18th C. palmo Romano, the palmo degli Architetti, in use in Roma, Italia (due to the comparison of the scales on the plan itself).
Additional book info
Original Italian text excerpt from Expl. Fol. 34, p.97 :
Italiano:"Tavola sessantesima seconda. Pianta della piscina ammirabile. Ui sono a’luoghi AA due entrate. Per li due gradini CC si scende al piano più basso. Questo si abbassa ancor di più in BB per raccogliere lo spurgo dell’acqua. Da questo luogo l’altezza è di palmi 39. La lettra D. mostra dove riusciva l’acquidotto."
Translation:
English:"Table LXII. Plan of the admirable pool. There are two entrances AA. The two steps CC lead one down to the lowest floor. The floor is lowered even more in BB to allow the collection of water during purging. From this place the height is 39 palms[6]. Letter D. shows where the aqueduct stood."
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↑Antonio Pasquale Favaro: "Metrologia o sia trattato generale delle misure, de' pesi e delle monete; Tavole delle Misure Antiche" - [Metrology or General Treatise on Measures, Weights and Coins; Tables of Ancient Measurements]. Napoli: Gabinetto Bibliografico e Tipografico, 1826. [See p.15: palmo, Roma (Antica) = 0.07715 m; p.88: piede di Parigi = 0.3248 m; p.96: piede di Inghilterra (Londra) = 0.30479 m; p.104: palmo di Napoli, Regno d'Italia = 0.26367 m; p.111: palmo degli Architetti, Roma, Italia = 0.23334 m]