HEMMI SLIDE RULE

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.

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.

No. 32 slide rule

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. 32 slide rule is the smallest pocket size rule with a semicylindrical lense. It is built with a magnifier to enlarge the scales two times more for easy reading. Smallest pocket size of No. 50 W.

The slide rule has the following scales: A, B, CI, C, D, K, S, L, T

The No. 34 RK “MANNHEIM” slide rule is only 5″ in length and is applied for general engineering. The No. 34 RK is the same to the No. 50 W slide rule in scales but reduced to 5″ in length. The slide rule has the following scales: A, B, CI, C, D, K, S, L, T

The No. 149A is a specially designed, compact slide rule equipped with a variety of different scales for convenient use by engineers and incorporates the following features.

Efficient multiplication and division Since the slide rule is equipped with DF, CF and CIF scales, off scale does not occur.

Perfect exponential calculation
Eight LL scales are provided to permit Ax type calculations even when A is a decimal fraction and x is a negative value.

Right triangles and vectors can be easily solved
Since HEMMI’s special “SI” and “TI” system, in which the S and T scales are graduated in the opposite direction, is employed for the trigonometric functions scales, right triangle, vector, and complex number calculations are extremely easy.

No. 250

Capable of exponential computations, No. 250 is made for Mechanical Engineering.

Convenient for computation of multiplication and division using DF, CF, scales folded a square 10.

Capable of exponential computations, No. 251 is made for Mechanical Engineering.

Pi-fold scales are provided and capable of exponential computation

No. 255 is a Duplex Type slide rule built for Electrical Engineering.

Simplification of of Hyperbolic Function and Vector Calculation

No. 257 is designed for quick solution of various calculations in chemical engineering.

Designed for quick solution to 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. Designed for quick solution to various calculations in chemical engineering The scales of Hemmi slide rules have been especially designed and arranged for efficient use by experienced engineers and incorporate the following special features:

EFFICIENT MULTIPLICATION AND DIVISION Since the rule is equipped with DF, CF and CIF scales, the troublesome interchanging of indices is unnecessary.
PERFECT EXPONENTIAL CALCULATION Eight LL scales are provided to make A x type calculations possible even when A is a decimal fraction and x has a negative value.
RIGHT TRIANGLES AND VECTORS CAN BE EASILY CALCULATED Since the “Ritez” system is employed in the trigonometric function scales and complementary angles are printed in red, right triangle and vector calculations are easier than ever. Right triangles, vector, and complex number calculations can be simplified by using these scales in conjunction with the DI scale.

No. 26D

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.

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.

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.

ODELCO BUILDING

HEMMI SLIDE RULE

No. 32 slide rule

No. 34 RK

No. 149A

No. 250

No. 251

No. 255

No. 257

No. 259D

No. 26D

No. P261