Editing Leon Theremin (section)

==Under Ioffe==
The day after Ioffe's invitation, Theremin started at the institute. He worked in diverse fields: applying the [[Max Laue|Laue effect]] to the new field of [[X-ray crystallography#X-ray analysis of crystals|X-ray analysis of crystals]], using hypnosis to improve measurement-reading accuracy, working with [[Ivan Pavlov]]'s laboratory, and using gas-filled lamps as measuring devices.<ref name="ima44">{{cite web |author=L. S. Termen |year=1970 |title=Erhöhung der Sinneswahrnehmung durch Hypnose |url=http://www.ima.or.at/theremin/?page_id=44&cat=1 |work=Erinnerungen an A.&nbsp;F.&nbsp;Joffe |language=de |access-date=2009-05-10 |url-status=dead |archive-url=https://web.archive.org/web/20110706093827/http://www.ima.or.at/theremin/?page_id=44&cat=1 |archive-date=2011-07-06 }}</ref> He built a high-frequency oscillator to measure the dielectric constant of gases with high precision; Ioffe then urged him to look for other applications using this method, and shortly made the first motion detector for use as a [[burglar alarm|"radio watchman"]].<ref group="note" name="G">Theremin recalled he made the dielectric device first followed by the radio alarm, although Glinsky ([[#G|p.&nbsp;23]]) writes Theremin made the alarm first and then the dielectric device.</ref><ref name="ima43">{{cite web |author=L. S. Termen |year=1970 |title=Die Erfindung des Theremins |url=http://www.ima.or.at/theremin/?page_id=44&cat=1 |work=Erinnerungen an A.&nbsp;F.&nbsp;Joffe |language=de |access-date=2009-05-10 |url-status=dead |archive-url=https://web.archive.org/web/20110706093827/http://www.ima.or.at/theremin/?page_id=44&cat=1 |archive-date=2011-07-06 }}</ref><ref>[[#G|Glinsky p.&nbsp;41]], "patent ... radio watchman and the Termenvox ... By December 8, 1924, Len had two [[German Empire]] patent applications pending".</ref>

While adapting the dielectric device by adding circuitry to generate an audio tone, Theremin noticed that the pitch changed when his hand moved around.<ref name="G24">[[#G|Glinsky p.&nbsp;24]].</ref> In October 1920<ref>[[#G|Glinsky p.&nbsp;26]]; but Theremin in 1983 recalled it was September.</ref> he first demonstrated this to Ioffe who called in other professors and students to hear.<ref name="1983 memoir"/> Theremin recalled trying to find the notes for tunes he remembered from when he played the cello, such as [[Le Cygne (Saint-Saëns)|The Swan]], by Saint-Saëns.<ref name="ima43"/><ref name="G24"/> By November 1920, Theremin had given his first public concert with the instrument, now modified with a horizontal volume antenna replacing the earlier foot-operated volume control.<ref name="1983 memoir"/><ref name="G26">[[#G|Glinsky p.&nbsp;26]].</ref> He named it the ''etherphone'',<ref name="G26"/> but it was known in the Soviet Union as the {{Langx|ru|Терменвокс|translit=Termenvox}} or {{Transliteration|ru|BGN/PCGN|Termenvoks}}, in Germany as the {{lang|de|Thereminvox}}<ref>[[#G|Glinsky p.&nbsp;53]],</ref> and later, in the USA, as the ''[[theremin]].''

On 24 May 1924 Theremin married 20-year-old Katia ({{Transliteration|ru|BGN/PCGN|Yekaterina Pavlovna|italic=no}}) Konstantinova, and they lived together in his parents' apartment on Marat street.<ref>[[#G|Glinsky p.&nbsp;36]].</ref> In 1925 Theremin went to Germany to sell both the radio watchman and Termenvox patents to the German firm Goldberg and Sons. According to Glinsky, this was the Soviet's "decoy for capitalists" to obtain both Western profits from sales and technical knowledge.<ref name="G4344">Glinsky pp.&nbsp;[[iarchive:thereminethermus00glin/page/43/mode/2up|43–44]].</ref>

During that time Theremin was also working on a wireless [[History of television#Mechanical television|television]] with 16 scan lines in 1925, improving to 32 scan lines and then 64 using [[Interlaced video|interlacing]] in 1926, and he demonstrated moving, if blurry, images on 7 June 1927.<ref name="G4344" /> His device was the first functioning television apparatus in Russia.<ref name="G45">Glinsky pp.&nbsp;[[iarchive:thereminethermus00glin/page/45/mode/2up|45]].</ref>