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. When / begins a word followed by k, g, m, mp or n, use lay (see lines I and 2); but (b) should an initial vowel precede / followed by these strokes, use el (see line 3).
a. When / ends a word after f, v, ray or two concurrent vowels, one of which is accented, use el (see lines 4 and 5); but (b) should a final vowel follow / thus preceded, use lay (see line 6). c. When following n or ng is the last consonant in a word, use el whether a vowel follows or not (see line 7).
63. L in Other Cases. a. When / precedes ng, use el. See line 8. b. When / is the first or last consonant in a word in any case not covered by the foregoing rules, use lay unless an inconvenient outline would result from so doing, in which case el may be used. c. When / is medial, use either el or lay according to convenience.
a. When r begins a word, use ray (see line 9), except (b) when followed by m or mp, in which case ar should be used (see line 10). c. When a vowel begins the word and is followed by r, use ar (see line 11) except (d) when the r is followed by a descending stroke (other than ar or ish) when ray should be used (see line 12).
a. When r ends a word, use ar (see line 13) except (b) after m, mp, ray, stroke-h, or two descending strokes, when ray should be used (see line 14). c. When a vowel ends the word preceded by r, use ray (see line 15).
a. When r is medial, ray is generally used, but ar may be used if more convenient, b. When r is the only consonant in the word, use ar when a vowel precedes; ray, when a vowel follows; and ar when r is both preceded and followed by a vowel.
The choice between the upward and downward forms of sh is entirely determined by convenience in forming the outline; the accompanying vowels have no effect in determining the choice.

 
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