is tuned at 1145kHz so that its local oscillator of around 1600kHz is to be received by radio set #1. Radio set #3 is also tuned at 1145kHz so that its local oscillator may produce the beat with radio set #2. Operator's hand movement around bar antenna of radio set #3 may affect the local oscillator to produce tonal change. The Matryomin by Masami Takeuchi, is a single-antenna Theremin-type device mounted inside a Matryoshka doll (aka Russian Doll). The Chimaera is a digital offspring of theremin and touchless ribbon controller and based on distance sensing of permanent magnets. An array of linear Hall-effect sensors, each acting as an individual theremin in a changing magnetic field, responds to multiple moving neodymium magnets worn on fingers and forms a continuous interaction space in two dimensions. See also List of Russian inventions Ring modulation References Publications Rockmore, Clara (1998). Method for Theremin. Edited by David Miller & Jeffrey McFarland-Johnson. Made publicly available at Clara Rockmore Method for Theremin [pdf] Film and video External links Music From The Ether ThereminWorld.com Pamelia Kurstin on Ted.com Theremin Times ThereminVox.com TECI: Theremin Enthusiasts Club International theremin Theremin Family Theremin Argentina Electronic musical instruments Continuous pitch instruments Inventions by Léon Theremin Experimental musical instruments Monophonic synthesizers Musical instruments invented in the 1920s 1928 introductions 1928 in the Soviet Union Soviet inventions Russian inventions Theremins