Richard and Diogenes 11. The answer is Chesterman.
What accessories do you have that need instructions? Have never seen any instructions for a vernier height gauge. Presumably expected that a user would be trained how to read a vernier and would already know how to use the accessories..
If you can read a vernier, the use of the other fittings should be pretty intuitive.
There should be the Scriber Blade, with a clamp to clamp it to the arm of the slider, (Maybe both a straight one and a dog leg one, so that with the blade on the surface of the surface table, the scale reads 2" ) a holder for a finger clock, (That also clamps to the arm in place of the Scriber/s ), possibly a slender pointer, and a checking gauge (Probably 2" )
There may well be a lever on the back of the slider that engages a reduction gear so that a smaller knob can be used to adjust the slider height more precisely.
These are the fitting with the ex industry 15" Shardlow vernier height gauge that i have.
I also have an 18" one. It was condemned because it it had an error of 0.002" over 18". An error of 0.0111% is not going to worry me!
It may well be worth buying an inexpensive magnifier to aid reading the Vernier.
Howard