This section is from the "A Shorter Course in Munson Phonography" book, by James E. Munson. Also available from Amazon: A Shorter Course in Munson Phonography
391. Assuming that the learner has up to this point in his study made it a rule to vocalize pretty fully everything that he has written, he must now be familiar with all the principles of vocalization, and have become quite expert in placing the vowel-signs to the outlines of words. He may, therefore, now begin to leave out those signs and to write nothing but the consonant outlines. In all practice from dictation for speed the vowel-signs should be omitted. This is called writing unvocalized phonography, which is the kind of phonography that all shorthand reporters and amanuenses write. And yet every phonographer must sometimes insert a vowel-sign in order to have his notes always readily legible ; so it will not be well to give up entirely and for all the vocalizing of words. A little special practice now and then with vocalized phonography should be kept up so as to keep the hand in. But the sooner one learns to read unvocalized phonography the better, and, with the exception of an occasional vowel thrown in for safety, the outlines should be left entirely without vocalization. Some phonographers hang on to the vowels too long, and so detract from speed, and at the same time actually endanger the legibility of their writing.
 
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