VINTAGE 1957 SUN HEMMI NO. 257 CHEMICAL ENGINEERING SLIDE RULE – MADE IN JAPAN
Wonderful vintage Sun Hemmi No. 257 duplex slide rule, manufactured in Japan and specifically designed for chemists and chemical engineers.
The rule is marked:
SUN HEMMI JAPAN – HI – NO. 257
The “HI” date code corresponds to September 1957, making this a genuine 1950s scientific/engineering instrument.
International Slide Rule Museum
This is not simply a standard classroom slide rule. The Hemmi No. 257 was designed especially for chemical-engineering calculations and incorporates numerous specialized scales. According to the original Hemmi instructions, its functions include ordinary multiplication and division, squares and square roots, logarithms and exponents, atomic and molecular weights, temperature conversions, pressure conversions, concentration calculations, saturated steam/vapor calculations, and other chemical-engineering functions.
International Slide Rule Museum
DETAILS:
Manufacturer: Sun Hemmi
Model: No. 257
Made in Japan
Date code: HI – September 1957
Approximately 12.6 inches / 320 mm overall
Bamboo construction with white scale surfaces
Duplex design with scales on both sides
Original metal-framed magnifying cursor/indicator
Specialized chemical engineering scales
Temperature scales for °F, °C and °K
Pressure conversion scales
Logarithmic and exponential scales
Numerous additional scientific calculation scales
The International Slide Rule Museum identifies the No. 257 as a bamboo chemical-engineering slide rule measuring approximately 320 × 44.7 × 7 mm.
International Slide Rule Museum
CONDITION:
Pre-owned vintage condition with age-related wear, discoloration, marks and surface wear as shown in the photographs. The center slide and cursor both move. Please examine all photographs carefully, as they are an important part of the condition description.
No case or instruction manual is included unless shown in the photographs.
An interesting collectible for a chemical engineer, chemist, scientist, engineering-history collector, slide-rule collector, or vintage scientific-instrument enthusiast.
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