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12 SPECTRUM LINES 12 SPECTRUM LINES—Continued 32 observations 46 observations 68 OBSERVATIONS blended spectra Bo P Bo capillary action central strip Chief Astronomer coelostat components computed DeL.on-C determinations difference in velocity Dominion Observatory earth's orbital velocity east limb ecliptic line equatorial velocity given in Table heliographic INDIVIDUAL OBSERVATIONS intensity July 14 July 25 June 21 km sec latitude left and violet limb point Lury mean value mean velocity measured displacement micrometer oil O'Connor observations at X4500 observed points oil error order spectrum Ottawa plane grating pole position angle radius vector rotation displacements rotational velocity Rowland scale settings solar disc solar image solar limb solar rotation spectrograph spectrum lines measured SPECTRUM LINES—Continued Plate spider thread strips of spectrum systematic difference systematic error TABLE VI—RESULTS Table XV tt 9 tt tt velocity of rotation VI—RESULTS FROM INDIVIDUAL wave-length west limb XIV—RESULTS yield a mean