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Hemmi 257 Chemical Slide Rule Lesson
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Take a class with Hemmi and learn how to operate a 257L Chemical slide rule. A full lesson on all regular slide rule functions, PLUS the operation of the famous Hemmi Chemical Rule!

This undated Hemmi manual is a great practical explanation of how all Hemmi duplex rules work, and how to read and set scales. In addition, the last portion of the manual covers all the special functions of the 257, including atomic weight, temperature and pressure. Just CLICK on the numbered link at the right to see each page.

Each double wide page is about 90K-140K, the entire booklet is about 2.5Mb. It is worth the wait to see it. Use your browser RETURN to come back here after each page, and you can print each one via your browser to make a booklet copy for review. If you click on the manual picture on the left hand side, the entire manual will download as a single ZIP file.

We believe this document is now in the public domain and had no copyright notice, but if we are incorrect, please advise, and we will remove it immediately.


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Click to download the whole manual as a ZIP file archive of JPG files
Click to download the whole manual as a ZIP file archive of JPG files
Click to download the whole manual as a ZIP file archive of JPG files
Click to download the whole manual as a ZIP file archive of JPG files
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Page 33 + 34 (Chemical Info)

Page 35 + 36 (Chemical Info)

Page 37 + 38 (Chemical Info)

Page 39 + 40 (Chemical Info)

Page 41 + 42 (Chemical Info)

Page 43 + 44 (Chemical Info)

Page 45 (General Care)


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