Does no one here do the daily Cryptoquote in the newspaper?
If you do, you already realize that, regardless of the Linotype
keyboard, letter frequency in English is highly variable, depending
on the sample used. About all that can be said is that E is the most
frequently-occurring letter in the English language. After that, the
also-ran slots are up for grabs. See, for example:
http://www.atlas-games.com/pdf_storage/lh_frequencies.pdf
So it's quite likely that the positions on the print drum were
determined by an independent analysis of a sample text.
--Chuck