Heron <Alexandrinus> - Heronis Alexandrini spiritalium liber

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6660HERONIS

XLIII.

Ex diftantiis voces avicularum hoc modo efficiuntur.

50[Figure 50]

Sit vas præcluſum, per quod infundibulum tranſmittitur, cujus caulis
à fundo tantum diſtet, quantum ad aquæ fluxum ſatis ſit. Superponitur au-
tem infundibulo vas concavum in cnodacibus verſatum, habensque in in-
feriori parte pondera, in quod aqua ſemper influit. Contingit igitur
vacuo exiſtente vaſe, quod in cnodacibus verſatur, ipſum rectum per-
manere: pondus enim habet in fundo appoſitum. Atque eo repleto aqua
in vas præcluſum effundetur. Et aër qui eſt in ipſo, per quandam fiſtu-
lam expulſus ſonum reddet. Exinanitur autem vas per quendam ſiphonem
inflexum: & in quo tempore exinanitio fit, rurſus vas repletum invertitur.
Itaque oportebit influxionem haud in medium vaſis incidere, ut ipſum
repletum ſubito invertatur.

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Scan	Original
61	55
62	56
63	57
64	58
65	59
66	60
67	61
68	62
69	63
70	64
71	65
72	66
73	67
74	68
75	69
76	70
77	71
78	72
79	73
80	74
81	75
82	76
83	77
84	78
85	79
86	80
87	81
88	82
89	83
90	84