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Meteorological Conditions 8
Errors in Micrometer Measurements of Spectrum Lines 18
The Double Spectrocomparator 29
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12 SPECTRUM LINES—Continued 32 observations adjusted axis blended spectra blended with spectrum centre of solar chromospheric coelostat house comparison spectra Computation:—(a computed concave mirror DeLury diameter difference Dominion Observatory ecliptic electric arcs equatorial velocity expressed in km Fe Fe Figure focal plane grating grouped Half-displacements expressed INDIVIDUAL OBSERVATIONS intensity iodine iodine-tube June June 21 km sec km./sec kn l./sec limb spectra lines 3 strong Lury means taken Measurement:—By O'Connor micrometer screws microscope mounted orbital velocity Ottawa OUTLINE OF OBSERVATIONS penumbral displacements plate left plate right pole prisms right and plate rotational velocity settings each line slit solar disc solar image solar limbs solar rotation Spectra of solar spectrograph spectrum lines SPECTRUM LINES—Continued Plate spectrum of centre spider thread strip of spectrum strong lines sunspot systematic errors TABLE VI—RESULTS Table XI velocity of rotation VI—RESULTS FROM INDIVIDUAL violet left violet right weak lines 0-3