This section is from the book "The Manual of Phonography", by Benn Pitman And Jerome B. Howard. Also available from Amazon: The Manual of Phonography.
A large final loop written involute on straight strokes and on the concave side of curves, represents str without intervening vowels (see lines 12 and 13). This loop extends about two-thirds the length of the stroke to which it is attached and is never used initially. When a vowel ends a word after str the loop cannot be employed.
The circle s follows the loop str (see line 14) just as it follows the small loop (compare line 4).
Exercise on the Loop-st.

Exercise on the Loop-str.

 
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