Thermophone
The thermophone ( Greek ) is an instrument with which heat generated by varying electrical currents at a resistor can be used to generate sounds by allowing this heat to expand the surrounding air.
A variant of the thermophone consists of several glass tubes of different lengths that are set up like organ pipes . Heating elements are attached to the inside near the bottom of the glass tubes . If you turn on the heating elements, the air heats up and flows convectively upwards. This creates a tone that depends on the length of the glass tube.
Individual evidence
- ^ Ferdinand Braun : Note about the thermophony. In: Annals of Physics and Chemistry . Vol. 65, 1898, pp. 358-360, facsimile of the BnF .
- ^ HD Arnold , IB Crandall : The Thermophone as a Precision Source of Sound. In: Physical Review . Vol. 10, 1917, pp. 22-38, doi : 10.1103 / PhysRev.10.22 .
- ↑ Lin Xiao, Zhuo Chen, Chen Feng, Liang Liu, Zai-Qiao Bai, Yang Wang, Li Qian, Yuying Zhang, Qunqing Li, Kaili Jiang, Shoushan Fan: Flexible, Stretchable, Transparent Carbon Nanotube Thin Film Loudspeakers. In: Nano Letters. Vol. 8, No. 12, 2008, ISSN 1530-6984 , pp. 4539-4545, doi : 10.1021 / nl802750z .
- ↑ Bandhu's European Notebook - Phase One: Murano - April 14-16, 2004 ( Memento from December 10, 2005 in the Internet Archive )