science

Shaftment

Shaftment is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Shaftment rather than just read about it. In short: The shaftment is an obsolete unit of length defined since the 12th century as 6 inches, which nowadays is exactly 152.4 mm. A shaftment was traditionally the width of the fist and outstretched thumb.

Key takeaways

Shaftment belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Shaftment to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Shaftment from memory before moving on to harder problems.

Reference excerpt

The shaftment is an obsolete unit of length defined since the 12th century as 6 inches, which nowadays is exactly 152.4 mm. A shaftment was traditionally the width of the fist and outstretched thumb. The lengths of poles, staves, etc. can be easily measured by grasping the bottom of the staff with thumb extended and repeating such hand over hand grips along the length of the staff.

History It occurs in Anglo-Saxon written records as early as 910 and in English as late as 1474. After the modern foot came into use in the twelfth century, the shaftment was reinterpreted as exactly 1⁄2 foot or 6 inches (152.4 mm).

Spelling and etymology Other spellings include schaftmond and scaeftemunde, and shathmont. It is derived from Old English sceaft, in turn from Proto-Germanic: *skaftaz ('shaft') and Old English mund, from the Proto-Germanic *mund, in turn from Proto-Indo-European: *man ('hand'). Two shaftments make a pes manualis (Latin for 'a foot fitted to the hand'). This unit has mostly fallen out of use, as have others based on the human arm: digit (1⁄8 shaftment), finger (7⁄48 shaftment), palm (1⁄2 shaftment) hand (2⁄3 shaftment), span (1.5 shaftments), cubit (3 shaftments) and ell (7.5 shaftments).

References

Further reading Units: S University of North Carolina at Chapel Hill - How Many? - A Dictionary of Units of Measurement Huggins, P.J. (March 1983). Saxon Building Measurements. Proceedings of the Conference on Computer Applications and Quantitative Methods in Archaeology. pp. 103–110. doi:10.15496/publikation-2845. hdl:10900/61423. CORE output ID 158278769.

Illustrations

Worked examples

Example 1 — a first encounter with Shaftment

Start with the simplest possible case. Write down what Shaftment claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Shaftment before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Shaftment ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Shaftment

In research: Shaftment appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Shaftment in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Shaftment is common in secondary-school and first-year university syllabi. It links to neighbouring topics Human-based units of measurement, Units of length, so understanding it makes those chapters shorter.
In everyday life: Look for Shaftment outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Shaftment in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Shaftment means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Shaftment out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Shaftment in simple terms?

The shaftment is an obsolete unit of length defined since the 12th century as 6 inches, which nowadays is exactly 152.4 mm. A shaftment was traditionally the width of the fist and outstretched thumb.

Why does Shaftment matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Shaftment?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Shaftment.