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Description: | none MANU probably Eduard Zimmerman. circa 1906 Emilienstrasse 21, Leipzig, Germany. DES probably after ROEMER circa 1875 This is a megaphone that probably belongs to GLAHM 129258. That is Roemer's voice activated switch or key that consists of a thin metal diaphragm and an electromagnetic relay. When the subject speaks into the diaphragm the vibrations causes it to make an electrical contact with a relay that rings a bell. It also operates a switch that can be used to operate other instruments such as Ranschburg's memory apparatus. The instrument can also be used by operating the toggle switch by pulling on the cord. The megaphone wold have helped concentrate the sound onto the diaphragm of the voice key. | 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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