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Dietzgen 1767P NATIONAL

• Type: Closed Body Enhanced Mannheim
• Size: 10 Inches / 25 cm
• Material: Boxwood, Paint and ink
• Scales:
  • Front: A [ B CI C ] D K
  • Back: [ S L T ]
• HvH: 733

Reverse printed with unit conversions and decimal fractions to 1/64. Inch and centimeter scales on body. The scales are painted or inked onto the surface, not "machine divided". This is demonstration model accompanying the book Slide Rule Simplified, by C. O. Harris, Copyright 1943, The American Technical Society. With box.

Dietzgen made another rule called the N1767, a simplex trig rule. I'm not sure why there's a collision of model numbers, but this 1767P is not that rule. Frankly, this is a pretty cheap piece of work, something intended to hold you over until you could get a real rule of your own. The book is the main event in this package; the slide rule was manufactured to meet a price point.

[edit] Slide Rule Simplified

I should say something about the book, and the era (1943) in which it was written. Mr. Harris was what we once called a draftsman, a practitioner of the lost art of drawing the plans for mechanical items by hand. Below is a sample of his work, done with no more than compasses, straightedges and the lost techniques of his art. CAD/CAM did not exist. The bridge you drove over to get to work today was probably drawn by hand. Think about it and marvel.