From here
http://www.aikiweb.com/forums/showth...ighlight=shaku
Quote:
Bryan Bateman wrote:
The armpit measurement is common with what I was taught back in the UK, but when I queried that over here I was told absolutely not. The jo is a fixed length and measured in the traditional Japanese unit "Shaku". 1 shaku is 30.3cm and a jo should be 4.21 Shaku, which equates to 127.563cm. The diameter of the jo is also based on an old measure (the name of which I can`t remember), and should be 2.43cm
You can do the metric to imperial conversions
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If I remember correctly, the measurements are Shaku, Sun and bu, with Shaku being 30.3cm, Sun being 3.03 cm and bu is 0.303cm. I was told in Japan that the Jo is most definately a fixed length. There's plenty of folks here in the west who dispute based on what they've been told, Make of it what you will.
rgds
Bryan