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http://www.codoh.info/incon/inconshr123.html#shrlk3
“[…]The Germans, in the context of reorganizing the Turkish army [fge: WWI], spent a great deal of effort in controlling typhus and other diseases.101 The two main tools of this effort were the Dampfdesinfektionwagens (mobile steam disinfection trucks) and the Turkish baths, which were converted for disinfection purposes.102 The Germans used primarily sulfur gas, which required a generator (Vergaser) that would burn the sulfur and provide the gas.103 Already at the beginning of 1914 the Germans were using vergasen (gasify, gas) as a synonym for begasen (fumigate). 104 […]“
and:
“[…]The same air circulation technology (Kreislauf) would be used in large railroad tunnels, which by means of the air circulation gas generating apparatus (Kreislaufvergasungsapparaturen) could fumigate an entire passenger train at one time.12 […]”
Reference 104:
“[…]In der Kaserne wurde dann die alte Kleidung, Wäsche, Bettzeug desinfiziert, die Zimmer mit Formaldehyd und gegen die Läuse mit schwefelige Säure vergast." quoted from Meyer's memoirs, Becker, op. cit., p. 38 […]
Becker, Helmut, Äskulap zwischen Reichsadler und Halbmond, Helmut Becker, n. p., 1990, provides an extensive survey including many extracts from primary sources and memoirs.