External links Blue wildebeest

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blue wildebeest photo , fact sheet
connochaetes taurinus, mammal species of world



























































































































































































































































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History Three-mirror anastigmat

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1 history 1.1 paul 1.2 paul-baker 1.3 korsch history many combinations of 3 mirror figures can used cancel third-order aberrations. in general these involve solving relatively complex set of equations. few configurations simple enough, however, designed starting few intuitive concepts. paul the first proposed in 1935 maurice paul. basic idea behind paul s solution spherical mirrors, aperture stop @ centre of curvature, have spherical aberration - no coma or astigmatism (but produce image on curved surface of half radius of spherical mirror, mirror in air). if spherical aberration can corrected, wide field of view can obtained. similar conventional schmidt design, schmidt refractive corrector plate instead of third mirror. paul s idea start mersenne beam compressor, looks cassegrain made 2 (confocal) paraboloids, both input , output beams collimated. compressed input beam directed spherical tertiary mirror, results in traditional spherical aberration. paul s key insight secondary can co...
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1 history 1.1 metropolis building 1.2 origin 1.3 construction history metropolis building the lot on building stands today bought serbian state in 1818. 1 of konaks of prince miloš obrenović located there. building seat of metropolis of belgrade , karlovci built in 1863. one-storey building, simplified , reduced ornaments on façade. though modest in terms of architectural value, important historically. before demolished make room new building, patriarch varnava commissioned painter kosta hakman paint edifice. hakman made 2 paintings in 1933, 1 of central building , of small auxiliary kitchen object. popular myth @ time claimed in kitchen object severed head of karađorđe kept in 1817, before miloš obrenović sent istanbul. paintings kept in museum of patriarchate @ patriarchate court in sremski karlovci. origin serbian orthodox church adopted new constitution in 1930. article 48 called construction of new seat of patriarchate in neighborhood of savinac, on vračar plateau. in process, chu...
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