The pneumatics of Hero of Alexandria

[1] This has, indeed, been conjectured to be an error for Ἥρωνος ἢ Κτησιβίου, but Baldi (in his edition of the Belopœica, p. 44,) has satisfactorily proved that Hero was the writer.

[2] That Ctesibius began his researches at an early age may be inferred from the fact mentioned by Vitruvius, ix. 9. (edit. Schneider.)

[3] On Vitruvius, x. 7. The sections of Hero and the corresponding chapters of Vitruvius are minutely compared by Schneider, Vitruv. vol. iii. pp. 283–330.

[4] Baldi arrives at the same conclusion: (p. 74) “Cæterum haud immerito quispiam dubitaverit quam ob rem Architectus Heronis nostri nomen silentio præterierit. Nos ideo factum putamus quod ille Ctesibio utpote inventori ea tribuere maluerit quæ ab Herone locupletiora et illustriora quam ipse a magistro accepisset evulgata fuere.”

CORRIGENDA.

Page 4, line 3, for them read it. 14, figure. The mouth of the vessel should be open. 25, line 8, for ⁷⁄₀₁ read ⁷⁄₁₀. 35, .. 25, after P R, read so that the goblet may be filled, and the pedestal M N O X as high, &c. 40, .. 6, for Wine and Water read Wine-and-Water. —, figure. The pipe S T should connect the vessels A B and C D near their bases. 43, line 23, for across a third pulley, C, to another pulley, S, read across the pulley S to another pulley, T. 61, .. 12, dele , after vessel. 62, .. 7 } —, .. 27 } for the Hercules read Hercules. 63, .. 6 } 79, .. 1, dele , after attached. 84, .. 4, read (from which extends the hand of the figure which is to pour the libation.) —, .. 6, read side of the wine vessel. 89, .. 23, for escaping read entering. 96, .. 18, dele , after partition. 105, .. 6, after this insert and communicating with it.

CONTENTS.