Astronaut propulsion unit Astronaut propulsion unit An astronaut propulsion unit (or astronaut maneuvering unit) is used to move an astronaut relative to the spaceship during a spacewalk. The first astronaut propulsion unit was the Hand-Held Maneuvering Unit (HHMU) used on Gemini 4. The Hand-Held Maneuvering Unit was the EVA "zip" gun used by Ed White on the Gemini 4 mission in 1965. The hand-held gun held several pounds of nitrogen, and allowed limited movement around the Gemini spacecraft. It was also used by astronaut Michael Collins on the Gemini 10 mission in 1966. The United States Air Force (USAF) Astronaut Maneuvering Unit (AMU)
Chinese as a foreign language "Arte de la Lengua Mandarina" was published in Canton in 1703. This grammar was only sketchy, however. The first important Chinese grammar was Joseph Henri Marie de Prémare's "Notitia linguae sinicae", completed in 1729 but only published in Malacca in 1831. Other important grammar texts followed, from Jean-Pierre Abel-Rémusat's "Élémens" (sic) "de la grammaire chinoise" in 1822 to Georg von der Gabelentz's "Chinesische Grammatik" in 1881. Glossaries for Chinese circulated among the missionaries from early on. Robert Morrison's "A Dictionary of the Chinese Language" (1815-1823), noted for its fine printing, is one of the first important Chinese dictionaries for the