Aquarius adds a stretch of de-chi immediately after the autopause to a
stretch before the autopause, differences the sum, and makes counts for
resemblance to the sum of two Delta-PSI's. The proportional frequency of each
letter depends only on the number of crosses in it. and the six switches are for
counting letters with 0,1,2,3,4,5 crosses: throwing more than one switch
provides "either - or",
Two counters are provided (generally used for all dots, all crosses.)
At first the comparison is made on a steadily increasing, text, thus: first
11 letters after the auto-pause with last 11 before; then first 12 after with last
12 before, and so on.
After the text length has reached 97 there is no further increase, but the
97 letters following the autopause are stepped back relative to the part before
the autopause. 97 letters are sufficient: in a long go-back the letters
immediately before the autopause may be rubbish.