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Concise: From Circular Slide Rules to the Dressmaking Table

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Hands and machinery in Concise’s official factory feature. Photograph: Concise / TTC.
Hands and machinery in Concise’s official factory feature. Photograph: Concise / TTC.

Before the electronic calculator became commonplace, a circular slide rule could put a calculation in your hand. Concise began with that kind of instrument. Its story connects a changing market, a Tokyo factory and the careful work of putting readable scales onto everyday tools.

1. A calculating instrument became a wider measuring business

The operation incorporated as Concise Keisanjaku Seisakusho in 1954. In 1956, it moved to a new factory in Hirai, Tokyo, and began making precision rulers, protractors and dressmaking tools using its slide-rule manufacturing experience. Concise’s chronology.

The chronology also records a difficult change: the 1973 oil crisis and cheaper electronic calculators reduced demand for slide rules. The company turned more strongly towards travel accessories in the 1970s. Measuring instruments remained part of a business that was developing other uses for its production skills. The change in direction.

In June 2018, five companies merged to form TTC. The current corporate profile identifies the Concise business division within TTC, with headquarters and factory in Tokyo’s Edogawa ward. The 1949 origins, 1954 incorporation and 2018 merger describe different stages of the same history. Current corporate profile.

2. Inside the production work

Concise’s factory feature describes printing, cutting, bonding and adjustments that respond to the behaviour of the material. It also shows equipment maintained over many years, alongside newer machinery. Its account emphasises work carried out in-house and the transfer of finishing skills to younger staff.

Production machinery in the official factory feature. Photograph: Concise / TTC.
Production machinery in the official factory feature. Photograph: Concise / TTC.

Checking is another visible part of the story. The feature describes careful inspection of finished drafting instruments before packing. These factory photographs illustrate the company’s wider manufacturing work; they do not identify a production batch of our particular 15cm protractor. Concise’s illustrated factory visit.

Explore this part of the story: Concise 15cm Half Circle Protractor.

Workshop equipment in Concise’s factory introduction. Photograph: Concise / TTC.
Workshop equipment in Concise’s factory introduction. Photograph: Concise / TTC.

In the factory photographs, hands and machinery share the frame. The work is easier to understand when you look at both. A machine provides a repeatable action; a person positions, checks and moves the material onward. A finished scale conceals most of that activity. It appears as a set of marks, ready to be trusted by the next person using it.

Hands checking a tool in Concise’s factory feature. Photograph: Concise / TTC.
Hands checking a tool in Concise’s factory feature. Photograph: Concise / TTC.

That is a satisfying connection between the old calculating instruments and a pattern-table measuring tool. Both turn an abstract quantity into something visible. The lines and numbers have to be read by a person working on another problem—an angle, a drawing, a calculation—without becoming a problem of their own.

Staff handling material in Concise’s factory feature. Photograph: Concise / TTC.
Staff handling material in Concise’s factory feature. Photograph: Concise / TTC.
Finished transparent scales shown in Concise’s factory feature. Photograph: Concise / TTC.
Finished transparent scales shown in Concise’s factory feature. Photograph: Concise / TTC.

3. From that history to a pattern table

The half-circle protractor at Eight Needles belongs to the drafting branch of this story. The product photographs show its numbered scales and origin opening. Its connection with sewing is therefore not an unrelated use of a stationery object: Concise’s own chronology explicitly records dressmaking tools among the applications of its measuring technology.

The 15cm half-circle protractor in the Eight Needles collection.
The 15cm half-circle protractor in the Eight Needles collection.

The protractor in our selection is one small part of this wider measuring history. Before using an angle on a pattern, it can help to draw a baseline on scrap paper and practise reading the scale from the intended starting side. You are looking for a clear relationship between the baseline, the centre and the second line.

This is also a good reason to keep the actual product photograph close to the story. Shape and scale layout matter more than the company name alone when you choose a measuring instrument. The listing below shows the particular Concise item at Eight Needles; the workshop pictures above explain the broader business it comes from.

4. Explore the collection by category

Explore by category

Protractor

Concise 15cm Half Circle ProtractorConcise 15cm Half Circle ProtractorView details & options →

Words: Eight Needles. Historical, workshop and product images are credited in their captions. Company and manufacturing sources are linked beside the relevant passages. Historical and manufacturing sources are linked beside the relevant passages. Product links open the live Eight Needles shop.

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