“The arrangement of these colors on Norman’s palette may vary somewhat, but the accompanying sketch shows a typical disposition. The colors in capital letters are those most frequently used.
“The palette consists of a heavy adjustable drawing table (the metal stand type) on top of which is a large piece of white glass known as “milk glass.” Such a stand permits the raising or lowering of the palette to the desired height. It can be used horizontally or tipped to any degree. Norman has equipped his stand with a box designed to accommodate tubes of color.
“He keeps red at the left, yellows next, then white, and at the right his blues, greens, black, and miscellaneous colors. An attached shelf behind this box accommodates his brushes.”
From Norman Rockwell, Illustrator, by Arthur Guptill. Thanks, Jason