<p>I believe <a href="https://zh.wikisource.org/wiki/%E6%AC%BD%E5%AE%9A%E5%8F%A4%E4%BB%8A%E5%9C%96%E6%9B%B8%E9%9B%86%E6%88%90/%E6%9B%86%E8%B1%A1%E5%BD%99%E7%B7%A8/%E6%9B%86%E6%B3%95%E5%85%B8/%E7%AC%AC122%E5%8D%B7" rel="noreferrer">this is</a> the original text:</p>
<blockquote>
<p>今有葭二莖生池中，並根杪齊，出水三尺，即葭一莖斜去至岸九尺，與水適平，問水深若干？</p>
</blockquote>
<p>It also comes with the following, hard to read, illustration:</p>
<blockquote>
<p><a href="https://i.sstatic.net/D7p3J.png" rel="noreferrer"><img src="https://i.sstatic.net/D7p3J.png" alt="enter image description here" /></a></p>
</blockquote>
<hr />
<p>This is the measure word you're asking about:</p>
<p><a href="https://www.mdbg.net/chinese/dictionary?page=worddict&amp;wdrst=0&amp;wdqtm=0&amp;wdqcham=1&amp;wdqt=%E5%B0%BA" rel="noreferrer">尺</a></p>
<p>MDBG:</p>
<blockquote>
<p>chǐ<br />
a Chinese foot / one-third of a meter / a ruler / a tape-measure / one of the three acupoints for measuring pulse in Chinese medicine / CL: 支, 把</p>
</blockquote>
<p><a href="https://en.wiktionary.org/wiki/%E5%B0%BA#Definitions" rel="noreferrer">Wiktionary</a></p>
<blockquote>
<p>1 chi; Chinese foot (a traditional Chinese unit of distance based on the human forearm and equal to 10 cun (寸) or 1/10 zhang (丈))<br />
2 (Mainland China) mainland chi; Chinese foot, standardized in 1984 as 1/3 meter<br />
3 (Taiwan) Taiwanese foot, standardized as 10/33 meter and identical to the Japanese shaku<br />
4 (Hong Kong) chek; Hong Kong foot, standardized as 0.371475 meters<br />
5 (informal) imperial foot<br />
6 ruler (straightedge) (Classifier: 把)<br />
7 tape measure</p>
</blockquote>
<p>Japanese Shaku is also:</p>
<blockquote>
<p>10/33 meter</p>
</blockquote>

CC BY-SA 4.0
2021-01-24T19:25:14.967Z
Wow, that is amazing! Thank you very much!
dietervdf
CC BY-SA 4.0
2021-01-24T13:40:41.823Z
2021-01-24T14:19:34.457Z
2021-01-24T14:19:34.457Z
Mou某
<p>According to multiple sources the following problem would be found in Suanfa tong zong (like on <a href="https://www.cut-the-knot.org/pythagoras/SangakuArt.shtml" rel="nofollow noreferrer">cut-the-knot</a>)</p>
<blockquote>
<p>Two reeds of equal height project 3 syaku above the surface of a pond.
If we draw the top of one reed 9 syaku in the direction of the shore
so that the top is just touching the surface of the water, find the
depth of the pond.</p>
</blockquote>
<p>(Cut-the-knot claims the book contains the illustration, but another source claims the illustration is Japanese)</p>
<p>Anyhow: I assume Syaku would be an ancient Chinese unit of measurement. But I couldn't retrieve any information on this unit. How is it defined, how much would 1 syaku be in modern units of measurement?</p>
<p>I tried digging up the original problem, but when searching for the original (or any later reprints) I get stuck on the Chinese symbols. Could anyone help me out?</p>
<p>Not sure if &quot;Chinese Language&quot; is the right place for this question. I've been thinking about or &quot;History of Science and Mathematics&quot;, but I think the probability of someone owning &quot;Suanfa tong zong&quot; would be the greatest here (?)</p>

CC BY-SA 4.0
2021-01-24T12:46:14.060Z
Are you certain it's Chinese? Syaku could be referring to [Shaku (unit)](https://en.wikipedia.org/wiki/Shaku_(unit)) (Syaku and Shaku are likely different romanisations of the same word in Japanese). It could also very well be referring to [Chi (unit)](https://en.wikipedia.org/wiki/Chi_(unit)), which is where Shaku is supposedly derived from (but apparently a different unit). Both units are around 30-33cm.
tangrs
CC BY-SA 4.0
2021-01-24T13:33:52.143Z
Well, according to the sources, this would be a translation from the Chinese book "Suanfa tong zong". But I'm not able to find a original source... 
It might be that it got translated into Japanese (and with the units adjusted), which then later was translated as above.
dietervdf
<history><old-chinese>
Is syaku an ancient Chinese unit of measurement (Suanfa tong zong)?
# Is syaku an ancient Chinese unit of measurement (Suanfa tong zong)?

(Asked by: username_0 on 2021-01-24)

According to multiple sources the following problem would be found in Suanfa tong zong (like on [cut-the-knot](https://www.cut-the-knot.org/pythagoras/SangakuArt.shtml))

> Two reeds of equal height project 3 syaku above the surface of a pond.
> If we draw the top of one reed 9 syaku in the direction of the shore
> so that the top is just touching the surface of the water, find the
> depth of the pond.

(Cut-the-knot claims the book contains the illustration, but another source claims the illustration is Japanese)

Anyhow: I assume Syaku would be an ancient Chinese unit of measurement. But I couldn't retrieve any information on this unit. How is it defined, how much would 1 syaku be in modern units of measurement?

I tried digging up the original problem, but when searching for the original (or any later reprints) I get stuck on the Chinese symbols. Could anyone help me out?

Not sure if "Chinese Language" is the right place for this question. I've been thinking about or "History of Science and Mathematics", but I think the probability of someone owning "Suanfa tong zong" would be the greatest here (?)

**Tags:** history, old-chinese

> **Comments:**
> **username_1**: Are you certain it's Chinese? Syaku could be referring to [Shaku (unit)](https://en.wikipedia.org/wiki/Shaku_(unit)) (Syaku and Shaku are likely different romanisations of the same word in Japanese). It could also very well be referring to [Chi (unit)](https://en.wikipedia.org/wiki/Chi_(unit)), which is where Shaku is supposedly derived from (but apparently a different unit). Both units are around 30-33cm.  
> **username_0**: Well, according to the sources, this would be a translation from the Chinese book "Suanfa tong zong". But I'm not able to find a original source...  It might be that it got translated into Japanese (and with the units adjusted), which then later was translated as above.  

---

## 1 answers

### Answer by username_2 on 2021-01-24. Score: 5 | Accepted answer

I believe [this is](https://zh.wikisource.org/wiki/%E6%AC%BD%E5%AE%9A%E5%8F%A4%E4%BB%8A%E5%9C%96%E6%9B%B8%E9%9B%86%E6%88%90/%E6%9B%86%E8%B1%A1%E5%BD%99%E7%B7%A8/%E6%9B%86%E6%B3%95%E5%85%B8/%E7%AC%AC122%E5%8D%B7) the original text:

> 今有葭二莖生池中，並根杪齊，出水三尺，即葭一莖斜去至岸九尺，與水適平，問水深若干？

It also comes with the following, hard to read, illustration:

> [![enter image description here](https://i.sstatic.net/D7p3J.png)](https://i.sstatic.net/D7p3J.png)

---

This is the measure word you're asking about:

[尺](https://www.mdbg.net/chinese/dictionary?page=worddict&wdrst=0&wdqtm=0&wdqcham=1&wdqt=%E5%B0%BA)

MDBG:

> chǐ  
> a Chinese foot / one-third of a meter / a ruler / a tape-measure / one of the three acupoints for measuring pulse in Chinese medicine / CL: 支, 把

[Wiktionary](https://en.wiktionary.org/wiki/%E5%B0%BA#Definitions)

> 1 chi; Chinese foot (a traditional Chinese unit of distance based on the human forearm and equal to 10 cun (寸) or 1/10 zhang (丈))  
> 2 (Mainland China) mainland chi; Chinese foot, standardized in 1984 as 1/3 meter  
> 3 (Taiwan) Taiwanese foot, standardized as 10/33 meter and identical to the Japanese shaku  
> 4 (Hong Kong) chek; Hong Kong foot, standardized as 0.371475 meters  
> 5 (informal) imperial foot  
> 6 ruler (straightedge) (Classifier: 把)  
> 7 tape measure

Japanese Shaku is also:

> 10/33 meter

> **Comments:**
> **username_0**: Wow, that is amazing! Thank you very much!  

---

