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Description: | Max Kohl Chemnitz (stamped on the rim of the larger orifice). MI3 (value of the resonanrt note). DES after HELMHOLTZ,Hermann,Ludwig,Ferdinand,Professor,von. circa 1876 Bonn, Germany. MANU Max Kohl. circa 1900 Adorffe Street, 20, Chemnitz, Germany. This is a spherical Helmholtz's resonator made from two hemispheres of spun brass, soldered equatorialy. A brass sheet annealed to the temperature, at which tallow soap chars, was spun over a wooden former on a lathe. The metal was forced, by a forming tool, to follow the pattern of the former. The operation was done in several stages due to re-annealing being required because of rapid work hardening of the metal. It is one of an set of seven. The narrow neck of the sphere was inserted into the ear and a seal made with softened sealing wax. The resonator could then be used to detect low amplitude frequencies from a spectrum of sound since it responded only to that frequency to which it was tuned and its harmonics. | 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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