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Description: | Bray Bianchi Rue de la Sorbone Paris Unites Centaines No 15 (engraved on the revolution counter body) MANU Bray Bianchi. circa 1860 Rue de la Sorbone, Paris, France DES after DOVE,Heinrich ,Wilhelm,Professor. 1851 Berlin, Germany. This siren consists of two discs, one which remains stationary and one which rotates. In both discs there is a single row, around the circumference, of obliquely cut elliptical holes. When the upper disc is rotated and air passed through the lower discs, from a pump via the wind chest into which it is fixed, the flow is alternately blocked or allowed to pass through the instrument. This produces a note proportional to the speed of rotation of the disc. The counter is driven from a gear on the shaft of the rotor mechanism. | License: | http://www.hmag.gla.ac.uk/spirit/rights/ | Publisher: | Hunterian Museum and Art Gallery, University of Glasgow | Rights holder: | Hunterian Museum and Art Gallery, University of Glasgow | Subjects: | SCIENTIFIC COLLECTION : | Source: | Hunterian Museum | Creator: | Hunterian Museum and Art Gallery, University of Glasgow | Identifier: | http://www.huntsearch.gla.ac.uk/cgi-bin/... | Language: | en-GB | Go to resource |
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