To determine the number of characters in a typeset line:
Find a printed sample composed in the size and type style desired.
Measure the length of the desired line in picas from the left margin
and draw a vertical line at this point down the right side of the
Count the characters between the left margin and the drawn line for
five representative lines.
Divide the total number of characters by five to get an average of
characters per line.
Divide the total number of characters in the typewritten manuscript
by the average number of characters per line of type. The result is
the number of lines the copy will fill.
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