Is there a relationship between the size of furo and ro sumi?
In addition to the basic measurements, you will notice that the circumference of each piece of sumi is quite a bit different. The Do zumi for the Ro is immense compared to the do zumi for the fuuro. The using ro sumi is totally impractical for use with a benibachi, for instance, as the tetsubin would come into contact with the sumi if ro sumi were to be use; it would be just impossible to use ro sumi in a benibachi, so of course fuuro sumi would be a must, emphasizing the difference in sizes.
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