As this book is intended specially for printers who use comparatively small quantities of ink, we decided to obtain the different proportions by measure instead of by weight. In accordance with this idea, we obtained a lot of brass circles of different sizes, and by careful tests and filing them down until they were right, finally got a dozen which bore the proper proportions to one another, as represented by the numbers in the following cut:
Then with the addition of a fine marble slab, a half dozen small ink knives, and about two hundred quarter-pound cans, we were ready to commence mixing the colors. Fig. 13 on Plate 2 was the first color made. The reader will please notice that the proportions are as 1 to 3 in this color. We first laid circles Nos. 5 and 15 on the slab; then took color No. 1 and filled circle No. 5 even with the top; then color No. 2 and filled circle No. 15 even with the top. Then we took a small ink knife in one hand and lifting circle No. 5 with the other, very quickly got all its contents on to the slab ready for mixing, and repeated the operation with circle No. 15. This would have been extremely difficult if the measures had bottoms to them, but in this case the marble slab was the bottom, and when
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