Fuji Yamayo Slide Rule - For Tape Measures - Temp, Sag, Tension Change

Description

Fuji Yamayo Measuring Slide Rule NO.MS 1201
Fuji Yamayo Measuring Slide Rule NO.MS 1201
Here is a very rare Fuji Yamayo Measuring NO.MS 1201 slide rule with case, instructions (in Japanese), and box. This slide rule deals with tape measures (made from various materials) and corrections due to sag, tension, and temperature. Very cool stuff! I used the Google Translate App on each page and can send those images through messages to anyone interested. Just send a message to me. The original price was 3,600 Yen.
To see the associated formulas, do an Internet search with "tape measure factors tension correction" and click on the Wikipedia article.
The slide rule is made of plastic and measures approximately 12 3/4 inches long by 1 3/4 inches wide.
The slide rule is new and unused. The case, box, and instructions all show signs of age and storage. The box shows some discoloration. The two-part plastic case has some red spots on the white piece. There is rust on the staples in the instructions booklet and it has bled onto the pages. (Please see all of the pictures and scans.)
The scales are:
+CP mm, [P, F2, F1] L m, -Cs mm
and
-Ci m, L
2
m, +-Ct mm [T, Fa, h. ℓ.δ] L m, Pn
(You can see the actual scales by clicking on the pictures and scans.)
Please check my other listings for other items, including more slide rules. Please feel free to email with any questions. Thanks for looking! baja_ron