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A hole near the end of a ruler is usually there so the ruler can be hung from a hook, nail or pegboard. Family Handyman also describes an older classroom use involving slate boards, as well as specialized holes for binders, drawing and crafts. The hole does not affect a ruler’s measuring accuracy.
A hole near the end of a ruler is generally there to make it easier to hang and store, according to a Family Handyman report, rather than to affect how it measures. Some rulers have additional openings for uses such as fitting into a binder, helping draw circles or guiding craft work.
The simplest purpose is storage: a ruler can be hung on a hook, nail or pegboard instead of being left in a drawer or on a work surface. The report says this can be particularly useful for longer metal rulers, which may not fit easily in a toolbox. The hole is a convenience, not a requirement for measuring.
The report also describes a historical classroom use. Before paper notebooks became common in schools, students wrote on reusable slate boards, which could be wiped clean with a damp cloth. Some students reportedly attached a cloth to a ruler with string passed through its hole, keeping a slate cleaner close at hand. The report does not give a date for this practice or establish that it explains every ruler’s design.
Other openings depend on the ruler’s intended use. Some school rulers have holes spaced to align with a three-ring binder. Certain specialty rulers use openings to hold a pin while a pencil traces a circle; craft and quilting tools may include openings or slots for marking fabric, creating patterns or guiding a rotary cutter. The report cautions that a compass is a better choice when circle measurements need to be exact.
A Small Feature With Practical Uses
For most people, the hole is a modest storage feature: it lets a ruler stay visible and accessible rather than getting buried in a drawer. That is especially useful in a workshop or classroom where long rulers are awkward to store flat. The feature also shows why two rulers that look similar may not be designed for precisely the same tasks.
For students, binder holes can keep a ruler with other school supplies. For quilters and paper crafters, openings and slots can support particular marking or cutting methods. Those specialized functions should not be assumed of every ruler, however. A standard ruler with a hole and one without it can both measure accurately; the opening itself does not change the ruler’s scale.
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From Slate Cloths to Storage Hooks
The Family Handyman report places the hole’s history in classrooms that used slate boards before paper notebooks were common. Students could erase and reuse the boards, and a cloth was needed to clean them. According to the report, some tied that cloth to a ruler through its hole. The provided material does not identify a particular school, period or manufacturer, so the historical explanation is best understood as a reported use, not a universal origin for all ruler holes.
Today, the report says the common purpose is hanging and storage. Product references included in the source material cover school and technical rulers, a Kapro ruler and a Westcott aluminum yardstick. Specialty tools add their own functions: the report names the Creative Grids Quick Trim Ruler as an example of a ruler with openings that can assist with circle drawing. Designs vary by manufacturer and intended use.
“The hole at the end of a ruler is mainly there for storage.”
— Family Handyman report
Not Every Hole Has One Purpose
The report does not establish a single origin for all ruler holes, nor does it say when the slate-cloth practice began or how widespread it was. The historical account is presented as one past use; it should not be taken to mean every ruler was designed for that reason. The source also does not specify which models or manufacturers use openings for particular craft tasks.
Design varies: some rulers have one hole, others have several, and many smaller plastic rulers have none. Without a particular product’s specifications, it may not be clear whether a hole is intended for hanging, binder storage or a specialized technique. What is clear from the report is that ordinary measuring accuracy does not depend on having a hole.
Check the Ruler’s Intended Use
No further development or product announcement is reported. For readers trying to use a ruler’s openings, the practical next step is to check the manufacturer’s instructions or product description, particularly for craft tools and circle-drawing designs. A standard hole can be used to hang the ruler; specialized openings may have instructions specific to that model.
When measuring or drawing a circle that needs to be exact, use a suitable measuring tool or compass rather than assuming a ruler’s hole provides precision. The available source material does not give a new timeline or forthcoming update on ruler design; it describes a longstanding feature whose purpose depends on the ruler.
Key Questions
What is the hole at the end of a ruler usually for?
It is generally for hanging and storage, allowing the ruler to be placed on a hook, nail or pegboard.
Were ruler holes used with slate boards?
The Family Handyman report says some students reportedly tied a damp cleaning cloth to their rulers through the hole so they could wipe reusable slate boards. The source does not date or quantify how widespread that practice was.
Can a ruler hole help draw a circle?
Some specialty rulers have openings that can hold a pin while a pencil traces a circle. Not every ruler is designed for this, and the report recommends a compass for exact measurements.
Do ruler holes make measurements more accurate?
No. The report says a ruler without holes can measure just as accurately as one with them. The openings serve storage or task-specific functions, not measurement accuracy.
Source: familyhandyman.com
