Set of Three Late 19th Century Educational and Industrial Drawing Notebooks letter blocks 3" tall x 3" diameter

3" tall x 3" diameter and in excellent condition

10 3/4" t x 10 5/8" w x 4" d and in good

I really love that even as they illustrate systematic scaling up or down of a particular image

Mid-century or earlier I believe (and indeed

Not fragile or flaking or coming off the stretcher

Set of Three Late 19th Century Educational and Industrial Drawing Notebooks letter blocks 3" tall x 3" diameterThe covers on these are pretty rough detached in the case of two of them but I've got a weakness for these old drawing instruction books, especially the more minimal ones as these are (focused on simple shapes, designs and patterns) and there are a couple curious drawings in here all their own (faces, skeletons.) I have not done a comprehensive job photographing, but photos here give a good sense a few favorites pages first, then a sampling of a few