This section is from the book "Box Furniture", by Louise Brigham. Also available from Amazon: Box Furniture.

Body. 1 Peanut-butter Box (about 4 3/4 in. deep, 12 1/2 in. wide, 18 1/4 in. long). 8 Salt Boxes (about 4 in. deep, 4 in. wide, 4 in. long).
Shelves. 3 Pieces 3/8 in. thick, as wide as the inside depth of the large box, and 81/4 in. long.
Make the rack the same as described for the Small Wall Rack, Illustration No. 21.
Fit and nail the shelves in place, spacing them equal distances apart, thus making four compartments of equal size. Place the rack on end and hang it in that position on the wall.
Place two of the small boxes in each compartment and put the spices in them.
 
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