I've just counted the number of characters on one line.
A Google Search says this:
Quote:
Search Results
“Anything from 45 to 75 characters is widely regarded as a satisfactory length of line for a single-column page set in a serifed text face in a text size. The 66-character line(counting both letters and spaces) is widely regarded as ideal. For multiple column work, a better average is 40 to 50 characters.”
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With my current font size and type (Georgia), the KA1 displays 62 characters per line: that is close to perfect. To match the font size of the paperbacks I still have lying around, I would need to go one step smaller, and to match the font size in the Musashi hardcover which I used for text area comparison, I'd need to go two steps smaller, compared to the size I'm now using. Thus, it's easily possible to obtain a line 60-70 chars long on the KA1, without making the fonts smaller than those in a normal book; chances are, they're a bit bigger.
Therefore, I think the KA1 is as close to the ideal size e-reader as you can get at this time. A reader like the KA1 is still small enough to transport without too much hassle. 8 inch would be the perfect size for an e-reader: perfect line length, and still a big font size for people who would need or want it.