| Airy's pendulum |
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| Dating | May 1915 |  |
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| The so-called perpendicular simultaneous pendular movements (the composition of two perpendicular sinusoidal movements) was first investigated in 1815 by the astronomer Nethaniel Bowditch (1773-1838) and then studied in 1857 by the physicist Jean Antoine Lissajous (1822-1880), of whom homonymous figures (obtained by changing the oscillation periods' ratio) are well-known. The tool, invented by George Biddell Airy (1801-1892), is a double pendulum with which is possible to produce with the sand the Lissajous' figures in a real simple way. These same figures can be obtained in acoustics using some special diapasons with mirrors and a luminous source (this is known as Lissajous' experience). |
| Web page | Airy's pendulum |
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| Section | Mechanics |
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| Window | C |
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| Conditions | | | Large | 35.0 cm (13.8 in) |
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| Width | 30.0 cm (11.8 in) |
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| Height | 78.0 cm (30.7 in) |
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| Materials | brass, glass, lacquer, [nylon] |
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| Sources |
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Battelli A. - Cardani C., Trattato di fisica sperimentale ad uso delle università, Francesco Vallardi, Milano, 1923, Vol. 2, pag. 37, fig. 19
Tarquini A., Apparecchi di fisica, Antonio Tarquini, Roma, 1928, pag. 28, fig. 112
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| The additional indications which integrate the items of the conservation's state have the following meaning:
(?) = maybe complete; M = maintenance; P = partial; R = restored; D = used for teaching; NC = not checked; X = impossible to verify. |