If you find a good crib for the version the Rev has used here, and it is online, would you mind posting the link?
archive.org/google books don't have scans of any of Shelton's works, unfortunately. Many years ago I obtained a Xerox of one of them (the edition for the version that Pepys used) from the British Library (Shelton's `Tachygraphy, 1647'). There is an academic reprint of this 1647 edition and an earlier 1642 edition, from 1970, edited by William Matthews (Matthews, W., 1970, Shelton and Pepys. The Augustan Reprint Society, Publication #145-146, UCLA, California). I also recall a reprint in Westminster''s public Central Library just off Trafalgar square that I copied out by hand when I was a kid (I never got into train spotting......).
The BL has many editions. The author's full name is Thomas Shelton; The first edition was 1626, called `Short Writing'; later editions (many!) were called `Tachygraphy', which is what we have here, and finally Zeiglographia in 1685. With the BL's copy-on-demand service it is easy enough to get hold of digital copies, but you have to pay, of course. I won't be doing that; and if I get stuck with the resources I have, I'll leave it to you or other researchers more diligent than me to pick up the trail on the Shelton-shelves in the BL.
Your snippets look tantalisingly close to Tachygraphy, and the other poster's full-page I think is exactly this system.
There's plenty more code in those registers than that I've uploaded, and if I feel game in the future, it would be good to know how to go about transcribing the rest.
The `Tachygraphy' pamphlets are easy to read and short. Spelling is obviously quaint to our eyes, and you have to work with the long ess (which looks like an f without a crossbar). The 17th century word for a `dot', which comes up a lot in these tutors, is `tittle'. These systems were reasonably sophisticated, not just a simple letter-for-letter cipher, so you will need to work through the pamphlet as the young Pepys would have done and learn the principles of the system. It's quite easy (about an afternoon's effort), and a lot of fun, and orders of magnitude simpler than modern systems like Pitman, Gregg or even Teeline. But as with all shorthands, each writer tends to mold the system in idosyncratic ways, so even knowing the system there is still plenty of head-scratching work to be done.
If you have amongst your registers any more extensive examples (10+ lines?), could you post one or two, with surrounding longhand context, if any?
Sean.