For over 50 years ago, De Leon Import & Export Corporation distributed the ideal slide rules acceptable for all markets in the world. Hemmi Bamboo Slide Rules were supplied to students and professionals in the Philippines by the company and today, continues to distribute modern and efficient instruments to an array of specialized fields.

After steady research for many years, Hemmi Bamboo Slide Rule Manufacturing Company finally reached to a top level of technique assuring to make the slide rules of excellent quality applicable for all purposes of calculation.

Now, we have the pleasure of recalling just a few of the important properties on Hemmi Bamboo Slide Rules.

  

 
Bamboo Slide Rules
"The Merits of Hemmi
Bamboo Slide Rule"
  Top Quality
Superb quality of Hemmi Slide Rules consisted in a standard uniformity achieved through the process of accurate machine control, especially by the precision gauge system in the practice of mass production.
  Accurate Calculation
All scales were engine-divided in sharp on snow-white celluloid by special graduation machine, which ensure on easy-to-read markings and invariable accuracy in calculations.
  Laminated Bamboo
Hemmi Slide Rules were constructed carefully from selected and well-seasoned laminated bamboo, which were most adequately joined together and combined in the very one rule assuring an everlasting protection against warping or swelling under varying climatical conditions.
  Easy Slide Operation
Bamboo was inherited of its special nature that permits silk-smooth adjustments of the rule's slide action to suit the slightest preference.
  Easy- to-Read Graduations
All scales are engine-divided in sharp, snow white celluloid by special graduation machine, which ensure an easy-to-read markings and invariable accuracy in calculations.

 

 

 

 

 

 

 

 

 

 

 

 

The Hemmi Bamboo Slide Rules are built to perform in different Engineering studies. Click on the slide rule and see a larger image of it along with information on its application, scales, accessories and instruction manual.
The No. 32 slide rule is the smallest pocket size rule with a semicylindrical lense. Quite popular for its magnifier, enlarging the scales twice as much for easy reading.
 
The No. 34 RK "MANNHEIM" slide rule is only 5" in length and is applied for general engineering.
 
The No. 149A is a specially designed, compact slide rule equipped with a variety of different scales for convenient use by engineers.
 
Capable of exponential computations, No. 251 is made for Mechanical Engineering.
 
Capable of exponential computations, No. 251 is made for Mechanical Engineering.
 
No. 255 is a Duplex Type slide rule built for Electrical Engineering.
 
No. 257 is designed for quick solution of various calculations in chemical engineering.
 
No. 259 D is a 25cm Duplex Type slide rule specially designed and arranged for efficient use be experienced engineers.
 
In addition to all the special features of No. 259 D, the No. 260 slide rule   is also equipped with the P scale to facilitate the determination of cosθ and other calculations by merely setting the indicator.
 

No. P261

Duplex bamboo body rule, 2 part hardboard case or leather case, with full manual. White celluloid scales, adjustable end braces. Has full log log scales and a P (Pythagorean) scale, plus DI. Scales are self-documenting on the right hand side of the rule face. Folded scales (DF, CF, CIF) at pi.
 
   

 
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