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Published online by Cambridge University Press: 27 June 2016
The colours and brightnesses of various details about 12″ or larger in diameter were measured on photographs taken in the two wave-lengths 4360 Å and 6100 Å, of the spiral galaxies: NGC 224, 598, 3031, 3623, 3627, 3628, 4192, 4217, 4254, 4258, 4321, 4565, 4631, 5194, and 5457. The plates were taken with the 500 mm meniscus astrograph at the Kazakhstan High Altitude Observatory near Alma-Ata. Extra-focal stellar images taken with a ‘two storied plate holder’ were used for standardizing.