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THE ISOPoor TOWER TELESCOPE
DETERMINATION OF POLARITY AND FIELD STRENGTH OF MAGNETIC FIELDS IN SUNSPOTS
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60-foot tower telescope angle axis bipolar groups calcium flocculi COCS coelostat compound quarter-wave plate Contr CSCO CSCS CSCSCS cycle Ellerman field strength figure following member following spots ftft grating Greenwich Group Hale half-wave plate heliostat hemisphere Kenwood latitude line of sight lines of force M M M M M M magnetic fields magnetic polarity member is Gr Mount Wilson Observatory n-component neutral line Nicol prism ONON oo oo oo OO Tf opposite polarity penumbra phenomena photographic plane position preceding member preceding spot rotated slit small spots Snow telescope solar image solar radius spectrograph spectroheliograph spectroscopic spectrum spot spectra spot-groups spots of opposite sun*s Tf OO Tf Tf umbra unipolar violet component Yerkes Observatory Zeeman effect Zeeman triplet